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From The Collaborative International Dictionary of English v.0.48:
Olecranon \O*lec"ra*non\, n. [NL., fr. Gr. ?; ? 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]