Syno Helper
Extension Actions
CRX ID
lbaijiblgbceeanmhfancjohnohfmeif
Description from extension meta
Get definition and synonyms of a word instantly
Description from store
Get the definition/synonym of any word in a webpage.
With synohelper Select any word on a webpage and see its definition or its synonym by using the context-menu option.
The definition can also be viewed in the extension popup page.
The best thing about Synohelper is that you can use it on pdf files too.