Here's a useful free on-line tool that combines search, photographs, and a dictionary. Shahi, is a visual dictionary created by Abdullah Arif (@abdullaharif). It is a simple, but clever idea - enter the word you want to search for: first you will get full definitions from Wiktionary, you can then have displayed alongside this user generated images from Flickr, a graphic search from Google, and a feed from Yahoo! (which was not working when I tried it).
I looked up the word "axe", and here are the results:
This saves looking up items separately on different websites. Of course this will all depend on how content is tagged, as you can see above there are photos of an axe that you can chop things with, but also ones of a body spray. In the Flickr feed there is less accuracy with photos of people and even a tree (which presumably was about to be chopped down with an axe). Abdullah's work here show how so much stuff can be combined on the web to give very useful learning tools. But also shows that we all should be better at tagging our content.