Plural of antebrachium; the forearms or the region of the arm between the elbow and wrist.
From Latin 'ante-' (before) + 'brachium' (arm, from Greek 'brachys' short), literally 'the arm before the hand.'
Your antebrachia are far more complex than they look — they contain two bones that can rotate around each other, letting you flip your palm up or down in ways that arms can't in other animals.
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