lunate bone /lo̅o̅″nāt/ [L, luna, moon; AS, ban] , the carpal bone in the center of the proximal row of carpal bones between the scaphoid and triangular bones. It articulates with five bones, the radius proximally, the capitate and the hamate distally, the scaphoid laterally, and the triangular medially. Also called os lunatum, semilunar bone.
