When it works it's fine. Unfortunately, it is not very comprehensive: it doesn't work a lot of the time for scientific words. Also I understand it is meant to be nonintrusive but sometimes the definition given is too simple to where I end up searching the word anyway.

Has always helped me ^_^

doesnt work anymore :(

No record of the installation. Double Click on word opened a window. I never go a single definition to show. All say "No Definition"

Would have been a useful addin but its missing a couple of functional elements, one of which is definitions or any clue as to where it's searching.

Not working

Doesn't seem to work "Anywhere"

This extension helps me in getting the exact word meaning by double clicking on the word without opening another tab and it is same as google dictionary thank you.

Just doesn't work.

I don't think its working anymore

It's good sometimes, but more often than not it can't find a definition, which doesn't make it a particularly comprehensive dictionary. And if a word is a plural or any kind of variation, it can't find it either, just the simple form of the word, and there's no way to get a definition by highlighting a word without the 's' or whatever on the end, because you have to double click, which naturally highlights the entire word.
There's just too many words it can't find.

No longer functional. If this is fixed I will be revising my review to give the extention the 5 stars it deserves when it is functional.

For those struggling to find a replacement as I was:

Definer by Lumetrium:
- seems to fulfill the same purpose in a more aesthetically pleasing package.

Hasn't been working for a while, keeps saying definition not found