http://visual.merriam-webster.com/    

Quoted Text

Merriam-Webster brings you this really cool visual dictionary.
Choose a theme, topic, and subtopic. Then lots of pictures come up to show you what you are looking for.
You can also listen to how it sounds by clicking the speaker button.

The Visual Dictionary Online is an interactive dictionary with an innovative approach.
From the image to the word and its definition, the Visual Dictionary Online is an all-in-one reference.
Search the themes to quickly locate words, or find the meaning of a word by viewing the image it represents.
What’s more, the Visual Dictionary Online helps you learn English in a visual and accessible way.
The Visual Dictionary Online is ideal for teachers, parents, translators and students of all skill levels.
Explore the Visual Dictionary Online and enrich your mind. Perfect for home, school or work. Discover a visual world of information!