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biceps vs. triceps

biceps vs. triceps: What's the difference?

The words biceps and triceps are most commonly used to refer to muscles in the upper arm (though there are also biceps and triceps in the leg). In the arm, the triceps is on the back, and the biceps is on the front—it’s the one showcased in the classic arm muscle flex 💪.

biceps

[ bahy-seps ]
noun,
  1. either of two flexor muscles, one (biceps brachii ) located in the front of the upper arm and assisting in bending the arm, and the other (biceps femoris ) located on the back of the thigh and assisting in bending the leg.

triceps

[ trahy-seps ]
noun,
  1. a muscle having three heads or points of origin, especially the muscle on the back of the arm, the action of which straightens the elbow.