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Definition of Triceps

Triceps: The muscle that extends (straightens) the forearm. The triceps can be felt as the tense muscle in the back of the upper arm while one is doing push-ups. The triceps has three heads, or origins. Its full name is the triceps brachii.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=8711
Last Editorial Review: 3/19/2012

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