Ulna

n.	1.	(Anat.) The postaxial bone of the forearm, or brachium, corresponding to the fibula of the hind limb. See Radius.
	2.	(O. Eng. Law) An ell; also, a yard.

Noun

1.

ulna - the inner and longer of the two bones of the human forearm Synonyms: elbow bone

arm bone, elbow bone, forearm, olecranon, olecranon process