semilunare

from The Century Dictionary.

• noun The semilunar bone of the wrist; the second bone of the proximal row of carpals, between the scaphoid and the cuneiform: so called from its concavo-convex shape in the human wrist. More fully called os semilunare. Also lunare and lungtum. See scapholunare, and cuts under Artiodactyla, hand, perissodactyla, pisiform, and scapholunar.