Definer - Word Finder, Translate, Ask AI, Images & Web Search Dictionary icon

Definer - Word Finder, Translate, Ask AI, Images & Web Search Dictionary

Extension Actions

How to install Open in Chrome Web Store
CRX ID
noagjioaihamoljcbelhdlldnmlgnkon
Status
  • Extension status: Featured
Description from extension meta

Multilingual translator and dictionary for smart word searches. Ask AI, define text on webpages, and use the included PDF viewer.

Image from store
Definer - Word Finder, Translate, Ask AI, Images & Web Search Dictionary
Description from store

Stop interrupting your reading flow to switch tabs just to define a word or translate a phrase. Definer is a powerful word finder and browser extension that brings the dictionary directly to you. Whether you are reading a complex article, studying a foreign language, or just need a quick synonym, this tool acts as your personal reading assistant.

Simply select any text on a webpage to instantly trigger the popup bubble. Unlike a basic Google Dictionary extension, Definer integrates multiple data sources, allowing you to use it as a paraphrase tool, an encyclopedia searcher, or a translation hub. It streamlines how you consume content online, making it the perfect solution for anyone wondering how to search for a phrase on a website without losing their place.

🚀 Key Features

✅ Instant definitions with zero clicks—just select the text to see meanings
✅ Built-in AI paraphraser to help rewrite sentences and understand context
✅ Support for EPUB files to help you read ebooks in the browser
✅ Integrated PDF translator capabilities (requires using the bundled PDF reader)
✅ American Sign Language dictionary support for visual learners
✅ IPA translator to help you master correct pronunciation
✅ Advanced figurative language recognition for complex idioms
✅ Multiple search engines included like Wikipedia and DuckDuckGo

Unlock the Power of Multiple Sources

Definer goes beyond simple definitions by allowing you to customize where your data comes from. While many users look for a standard Google Dictionary experience, this extension lets you connect to a wide array of informational tools. You can perform a specific Wikipedia search to get historical context or use the Bing Image Search source to see visual representations of the selected text.

If you value privacy and variety, you can toggle on the DuckDuckGo search integration. The extension also supports custom iframes, meaning you can add your own preferred data sources. This flexibility makes it far more versatile than a standard mouse tool or linguistic extension.

AI-Powered Writing and Reading Aid

Writing and understanding complex text is easier with artificial intelligence. Definer includes an AI grammar checker to help you verify syntax and structure. If you run into a complicated sentence, you can use the AI source as a paraphrase tool to simplify the language. This is incredibly useful for students and professionals who need to grasp difficult concepts quickly. The AI Paraphraser ensures you understand the nuance behind the words, not just the literal definition.

Language Learning Made Easy

For language learners, context is everything. Definer acts as a comprehensive multilingual dictionary that helps you bridge the gap between languages. If you are learning English, the English IPA translator feature is essential for understanding phonetic pronunciation. For those interested in non-verbal communication, the inclusion of a Sign Language dictionary makes this a unique educational tool.

You can also use this tool to translate Google results or foreign news articles instantly. It is designed to be a robust translation software that sits quietly in your browser until you need it. By handling phrase search requests efficiently, it helps you learn idioms and figurative language that standard dictionaries might miss.

Works on Specialized Formats

Most extensions stop working when you leave a standard HTML webpage, but Definer works hard to be accessible everywhere. It includes a specialized reader that allows for PDF translator functionality, so you can read reports and papers with the same ease as a blog post. Additionally, it supports EPUB files, turning your browser into a fully functional ebook reader with instant lookups.

💡 Use Cases

For Students: detailed research often requires checking multiple sources. Instead of opening new tabs to search Wikipedia or DuckDuckGo search engine results, get the info right in the popup.

For Language Learners: Use the IPA translator and phrase search features to master pronunciation and usage. The extension serves as a complete linguistic extension for your daily practice.

For Professionals: Use the AI grammar checker and paraphrase tool to refine your emails and reports, ensuring your communication is clear and professional.

For eBook Readers: Load your books into the EPUB reader and enjoy a seamless reading experience where every difficult word is just a text selection away from a clear definition.

❓ Frequently Asked Questions

How to search for words on a page?
Simply select the text you want to look up using your mouse. The Definer popup will appear instantly with the definition or translation.

Can I use it as a free word search tool for PDFs?
Yes, but you must open the PDF using the integrated PDF reader that comes with the extension. This allows the word finder features to work on document formats.

Does this work as a word search online tool for foreign languages?
Absolutely. It functions as a multilingual dictionary and translation extension, supporting dozens of languages for both input and output.

How to search for a word on a page using AI?
Select the word or phrase, and choose the AI source in the popup bubble. You can ask for definitions, synonyms, or even ask it to explain the text like a tutor.

Is this better than a standard Google Dictionary?
Definer offers more customization. While it can provide similar definitions, it also offers AI integration, PDF support, and access to other search engines like Bing and Wikipedia.

⚠️ Troubleshooting Setup

If something isn't working properly, here's what you can try:

Restart your browser. This often fixes minor glitches.
Temporarily disable other extensions. They can sometimes conflict with each other.
Reinstall the extension. If all else fails, a fresh install might do the trick.
Still having issues? Head over to the r/lumetrium_definer subreddit or seek support via email. Include screenshots of the issue if possible, as this might help resolve your problem more quickly. Be sure to mention which browser you're using.

📧 Contact & Community

You can always leave a review if you have any thoughts or suggestions. If you'd like to chat, report a bug, or share ideas, come join our Reddit community: https://www.reddit.com/r/lumetrium_definer

On Reddit, you can find release notes, see what features people are requesting, participate in discussions, and even get sneak peeks of upcoming updates before they launch.

Want to reach out directly? You can email me (the author of this extension) at [email protected]

Latest reviews

Fahim Akhtar
Really appreciate this wonderful effort, it's really helped me a lot, thank a lot to all the team members.
Indah Ginting
I use this every time I want to learn English or Japanese; as I explore the web, I can look up the meaning and have it directly translated into my native language, eliminating the language barrier. Easy-to-use UI with the ability to add custom sources. In the future, please include DeepL as a source because their translation is excellent. Anyway, it's a very useful and user-friendly software. Thank you so much for creating this extension.
Đỗ Văn Trí
I have to login to vote. Amazing extension
Dirk Wilson
Genuinely impressive with the number of useful features, customization, and feel. No other dictionary extension comes close.
Patrico
Useful.
Νίκος Παπαμανώλης
It does work, but unfortunately it doesn't in pdf and epub tabs
Jaideep Ray
Fantastic! Exactly what I wanted. Awesome tool with everything I ever needed. All the hassle of finding meaning of words on my screen randomly anywhere, just gone. Thanks to whoever solved this problem, you are a genius. Lots of love to you!!
LIST T
smooth and amazing
Panduka Warun Bandara
I just started using Definer, and I’m genuinely impressed. It’s such a handy tool — you can translate, search, and access so many features with just a single click. The interface is smooth and intuitive, and it makes looking up information or meanings incredibly fast. Didn’t expect it to be this good, but it’s quickly becoming one of my favorite tools!
marin
i have been using this for more than a year now and i really appreciate how useful it is and the user interface is so beautiful.
Debesh Derebe (Mesay)
Great language extension! I'm learning a new language right now, and it's really helping me. It's really working well. Thank you!
Lemmingway Ark
Very satisfied with it! I use it for my own personal dictionaries, for dictionaries that have no pop-up extension apps, by only using Google Spreadsheets as the source file! Now all I have to do to translate obscure words is double click a word, and it'll translate for me. Definitely recommend it!
Gina Petrovitch
This is fantastic! I added a thesaurus to one of the custom sources, and it's working so well. Perfect for me and my kiddos to learn new words and expand our vocabulary at a click of a button. Thank you!
Omar
Best extension I have seen so far. Excellent for reading PDFs on web browsers.
Gu Barr
Definer is good to use for me to search definition of words.
Ivan Yanev
can you make definer remember translated words (history of words)
Mine Chow
It was a protect tool for me, but not able to use it anymore. Would you please provide an option to choose whether to use the "/responses" endpoint or not? I set OpenAI as the provider to use an OpenAI-like LLM service, but they do not support this endpoint.
Pro DZ
that what im looking for thanks :D
Andres Merschon
Excellent on the fly translator and dictionary. Please add Takoboto for Japanese translation.
Abhijit Ezhava
Coming from Google Dictionary, and it's worth it.
Jaeman Lee
Awsome. Can you add DeepL?? Now I am using custom https://www.deepl.com/en/translator#en/{{lang}}/{{str}} + CSS #product-navigation-sidebar-container, [data-testid="product-navigation-sidebar-container"], [data-testid="product-navigation-sidebar"], header[role="banner"], footer[role="contentinfo"] { display: none !important; } .no-sticky-header, [class*="sticky top"], [class*="sticky-top"], [class*="fixed top"], [class*="header"] { display: none !important; } [class*="banner"], [class*="promo"], [class*="hero"], [data-testid*="promo"], [data-testid*="banner"], [data-testid*="jobs"] { display: none !important; } /* OneTrust */ #onetrust-banner-sdk, #onetrust-consent-sdk, .ot-sdk-container, .otFloatingButton, .ot-sdk-show-settings, /* Usercentrics */ #usercentrics-root, #uc-center-container, .uc-consent-root, /* CookieConsent */ .cc-window, .cc-banner, .cookie-consent, /* cookie/consent included */ [id*="cookie"], [class*="cookie"], [id*="consent"], [class*="consent"] { display: none !important; } .hidden.justify-center.gap-2.border-e.border-t.border-gray-100.bg-white.px-5.py-3.max-md\:flex, .mobile\:hidden.flex.items-center.justify-between { display: none !important; visibility: hidden !important; }
7Jazzy Jazzy
Wish I found it earlier! It's awesome
Arsenii
This exstension has improved my web experience a lot. But i just hope there wouldn't be annoying payment requirements... don't ruin this excellent thing!
Олег Барамиков
When using the Arc browser with a specific extension enabled, I’m unable to sign in to platform.openai.com via Google. I get the following message: “We ran into an issue while authenticating you. If this issue persists, please contact us through our help center at https://help.openai.com.” Disabling the extension resolves the issue. Might be worth looking into compatibility.
Adrian A
It's working perfectly. The only issue I have is that when I open the Google search window, Google's AI Overview option appears for a split-second, before disappearing from the I-frame. This happens to me in Brave browser. Please fix this, because this extension is otherwise very useful.
ghfbfb ghfnvvh
scam
Julian Harris
alot more useful than google dictionary
kei wilson
Awesome extension! It's comprehensive and significantly improves my reading experience and access to non-native language materials. It would be even better with vocabulary.com and etymonline as sources.
Chensong Li
Such a fantastic extension! Very smooth, very concise and clean, and exactly functioning as a dictionary and translator. I wish I can pay for it! But it only accept cryptocurrency, which I don't have. That is the only downside!
p fuhad
Awesome app. Can you provide option for 11labs tts api with our .own key
Farhad Barahimi
This extension is fantastic! It's comprehensive and exactly what I wanted for daily reading. Thank you!
Dang Khanh Dinh
It's a neat extension. I'm used to using Look Up feature on Mac, which isn't a built in feature on Windows. This extension did exactly that.
Ȼaptain Jøhn “Søap” MacTavish
Needs Wikitionary as a source
YESEUL JEONG
This is a truly wonderful extension meeting most of users' requirement.. I really appreciate that!:) If I may, I would like to make one small feature suggestion. For language learner, it's essential to selectively review the newly learned words. Would you kindly consider adding the history download features like google dictionary extension?
Showrav Acharjee
a must have extension for people like to read a lot online, and my god the level of customization is insane! was looking for this sort of extension for a long time. many thanks to the developer.
Tran Hung
Really wonderful extension, a lot of choices, a lot of freedom for the user, it's not simply an dictionary, but a tool for searching in click. Learn how to use it and it will help you a lot. And another best thing, if you have any idea to improve the extension, you could contact the developer, he/she eager to hear you and support you very quick
VU HOAN PHAM VAN
Your app is truly amazing — thank you so much for creating such a helpful tool! I use it regularly and really appreciate the thoughtful design and smooth experience. I have one small feature suggestion that I think could make it even better: would it be possible to add a highlighting feature, similar to what the Chrome extension Web Highlights offers? (https://chromewebstore.google.com/detail/web-highlights-pdf-web-hi/hldjnlbobkdkghfidgoecgmklcemanhm?hl=en). I often highlight important content while reading online, and it’s incredibly convenient when those highlights are saved and reappear whenever I revisit the page. It would be wonderful if your app could support something like that — ideally for both webpages and PDFs (including local files and URLs). Thanks again for all your work — I’m truly grateful for what you’ve built, and I’m excited to see how the app continues to grow!
Olesia Kniazeva
Your app is just perfect! I tried to find one which can make translations with ai, as well as give me definitions, but it giving far more then i expected, it was such a pleasure to see youglish in there! And all those configurable options! And it's design is so nice. It would be even more great if you would add tatoeba site by default, with configurable option on amount of words for an example sentese to include based on selected word. (https://tatoeba.org/en) and it would be nice to have forvo as well for audio from natives (https://forvo.com/) But actually, it's already such a great helper extension, can't even think about better option! Thank you for this aid for language learning
ansh
just wow
Zahara Kendagor
An amazing dictionary tool. Quite literally the best I've ever used. It doesn't just look up words, it can be used to look up entire phrases and slang terms. And setting up hotkeys makes this tool super easy and convenient to use. I don't know what I ever did without this!
Emre Yildizci
I really like the extension and have been using it for almost a year I think. But recently google search option has been giving me the "I'm not a robot" checkbox page and it never goes away even when I check the checkbox
Khelfaoui 04
it's very good extension . it has fast search . you should be get it
Cloud Studio
Can't make double tap to define feature for PDFs. yeah, I gave it permission for url files. hopping for you to look into it Otherwise, an excellent extension.
Deepak Shah
Absolutely delighted to use this, it's well made, and is certainly better than the defaults! I like the onboarding, also, an extension where the usage and features are so well described!
Daniel Barreto
I'm really impressed with how well this extension works.
Austin Pang (4us9)
This extension is a god send! I was getting really annoyed with Google's Dictionary so much so that I planned on making an extension myself, lol. After being frustrated enough from Google Dictionary extension, I came across Definer. This is what I wanted and more.
Ian Joseph
Absolutely amazing and incredibly useful for a multitude of workflow relief. God, I love this extension! I want to reiterate the words of the other reviewers here and acknowledge the creators effort to make this app as high quality as it is. Magnificent work and this is now a solidified part of my workflow and keeps me on task effectively. Thank you for this amazing extension and I wish you even more success!
Sam Bay
I love the Definer. Is it possible to add tooltip hover feature?
V B
14/10/2023 - 5 stars Hi, i want to get definitions and images together, how to do it? 07/04/2025 - 1 star Please add the functionality to get definitions and images together without clicking on the image tab. This will be much better for association-based learning.
V B
14/10/2023 - 5 stars Hi, i want to get definitions and images together, how to do it? 07/04/2025 - 1 star Please add the functionality to get definitions and images together without clicking on the image tab. This will be much better for association-based learning.