Plural of biceps; the large muscles in the front of your upper arms that help you bend your elbow and lift things.
From Latin bi- (two) and ceps from caput (head), literally 'two-headed.' The biceps muscle has two points of attachment at the shoulder, giving it its name.
Your biceps are called 'two-headed' because they attach to your shoulder in two places, and this anatomical naming system helped early anatomists describe thousands of muscles in the human body with precision.
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