olecranon(n = noun.body) olecranon process - process of the ulna that forms the outer bump of the elbow and fits into the fossa of the humerus when the arm is extended; Array
olecranon, n. [NL., fr. Gr. ; elbow + krani`on the head.].
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]