Definition of Mega- (prefix)Mega- (prefix): The combining form "mega-" comes from the Greek "megas", great or big and means abnormally large. Examples include: Megalocephaly is too large a head. Megacardia is too large a heart. Megacolon is too large a colon. Source: MedTerms™ Medical Dictionaryhttp://www.medterms.com/script/main/art.asp?articlekey=4331 Last Editorial Review: 9/20/2012
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