n. A bone of the wrist, that one of the proximal carpal bones which is upon the ulnar side, in man the cuneiform: opposed to radiale. See cuts under Artiodactyla, carpus, hand, Perissodactyla, and Plesiosaurus.n. In ornithology, that one of the two free carpal bones which is upon the ulnar side (the other being the radiale), not necessarily with the implication that it is the cuneiform of a mammal. See cut under pinion.