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olecranon

o·lec·ra·non [ ō lékrə nòn ] (plural o·lec·ra·nons)


noun 
Definition:
 
elbow bone: the upper end of the ulna bone that extends beyond the joint of the elbow to form the elbow's hard projecting point

[Early 18th century. < Greek ōlekranon< ōlenē "elbow" + kranion "head"]
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