The part of the arm between the elbow and the wrist; plural of forearm.
From 'fore-' (front or before) + 'arm' (from Old English 'earm'). The term specifically refers to the front or lower portion of the arm, contrasting with the upper arm. Used anatomically in English since medieval times.
Your forearms contain two bones—the radius and ulna—that can actually rotate around each other, which is why you can twist your palm up and down; most mammals can't do this as freely, which is why humans are so good at complex hand movements.
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