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Definition of Pro-

Pro-: A combining form (from both Greek and Latin) with many meanings including "before, in front of, preceding, on behalf of, in place of, and the same as." Used as a word, pro of course means professional and, in medicine, it is short for prothrombin.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=5049
Last Editorial Review: 8/28/2013

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