olecranon

noun

1. 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
   Terjemahkan ke Indonesia sumber: wordnet30
2. 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.
   Terjemahkan ke Indonesia sumber: webster1913