Etymology
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triceps (n.)

the great extensor muscle, 1704, from Latin triceps "three-headed," from tri- "three" (see tri-) + -ceps, from caput "head" (from PIE root *kaput- "head"). So called because the muscle has three origins.

updated on August 21, 2017

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Definitions of triceps from WordNet

triceps (n.)
any skeletal muscle having three origins (but especially the triceps brachii);
From wordnet.princeton.edu, not affiliated with etymonline.