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We rely heavily on definitions in framing our questions. You may rely on any reliable source for your definitions. It is best to use a variety of resources, including a textbook.

Merriam-Webster’s Online Dictionary
If you can't find a word or if you know there are multiple spellings for it, try here: www.m-w.com. For multiple spellings, use whichever version they have listed first.

Google Definitions
Use Google to get glossary definitions gathered from various online sources by typing the word "define," then a space, and then the word(s) you want defined in the Google search field.  If Google has seen a definition for the word or phrase on the Web, it will retrieve that information and display it at the top of your search results. 

Google also has an automatic spell check, so if you spell a search word improperly, it often notices with a line such as: Did you mean: innocuous?

Dorland's
One of our favorite medical dictionaries is Dorland's.  If you are working on a medical subject and you do not have an electronic version, please request a copy from us.  We can also provide instructions for installing the dictionary as well as the spell check feature that comes with the program.

Stedman's
Some people have experienced rare errors with Dorland's returning unclear or inappropriate definitions. If this happens to you, we also have Stedman's dictionary available. Simply contact us to request a copy.