Online Dictionaries

Cambridge Learner's Dictionary. Designed for English language learerns. After looking up a word, scroll to the bottom of the page for more useful information.

Longman ESL Dictionary:  Type your word and click "search."  The definitions are limited to common words.

Merriam Webster Dictionary:  When the definition comes up, click on the speaker icon to hear the word pronounced. 

Merriam Webster's Learners Dictionary: (For ESL students) Subscribe to a free "word-of-the-day" lesson, do pronunciation practice, and more.  has definitions and some translations available

Google Images can work as a"picture dictionary" for many concrete words and ideas.

Visuwords: A remarkable graphical dictionary. Type in a word and view the results in colors, shapes and lines.