In addition to the print dictionaries that you can find in the library, there are many online medical dictionaries that you can use to define your terms.
Within the database Health Source, choose Medical Dictionary from the blue bar:
MEDLINE Plus also provides a free online medical dictionary:
http://www.nlm.nih.gov/medlineplus/mplusdictionary.html
Look at the online medical dictionaries available and choose which one you would like to use.
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At this time you can define your medical terms using the dictionaries listed!