Google Dictionary is a Chrome-only extension that pops up a definition when you double-click any word on any page, plus a toolbar lookup and a searchable history of past lookups.
It gives you an inline definition without leaving the page or opening a new tab to search - a small thing that adds up when you're reading dense copy, legal text, or unfamiliar terminology on a client's site.
Handy when you're reviewing UX copy or content on a live site and hit a word you want to double-check the precise meaning or connotation of before flagging it in feedback.
It's Chrome-only with no equivalent from Google for other browsers, and it won't work on tabs that were already open before install - you need to reload them first.
See the definition of any word on a page, instantly, without leaving it.
