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Definition of ulna : 1. An ell; also, a yard.
2. The postaxial bone of the forearm, or branchium, corresponding to the fibula of the hind limb. See Radius.

Synonyms:

bone, backbone, collarbone, breastbone, coccyx, cheekbone, ball-and-socket joint, clavicle, bone marrow, ankle, elbow bone

Usage examples:

• " In most quadrupeds, as in ourselves, the forearm contains distinct bones called the radius and the ulna. - "Thomas Henry Huxley; A Sketch Of His Life And Work", P. Chalmers Mitchell.
• Ulna, the larger of the two bones of the fore- arm. - "A Manual of the Antiquity of Man", J. P. MacLean.
• Of course not, Ulna, but I do not understand you. - "Lost in the Cañon", Alfred R. Calhoun.