a. (Anat.) Of or pertaining to the olecranon. [ 1913 Webster ]
n. [ NL., fr. Gr. &unr_;; &unr_; elbow + krani`on the head. ] (Anat.) The large process at the proximal end of the ulna which projects behind the articulation with the humerus and forms the bony prominence of the elbow. [ 1913 Webster ]