noun. The bone extending from the elbow to the wrist on the side opposite to the thumb in humans.

noun. A corresponding bone in the forelimb of other vertebrates.

noun. The inner one of the two bones of the forearm, between the elbow and the wrist, the other being the radius; the bone which makes a strict hinge-joint at the elbow with the humerus, and about which the radius revolves in pronation and supination, when the ulna reaches to the wrist and these movements are practicable.

noun. In entomology, the stigmatic or marginal vein of the fore wing.

noun. A unit of length; a cubit; an ell.

noun. In ichthyology, the hypereoracoid.

noun. The postaxial bone of the forearm, or brachium, corresponding to the fibula of the hind limb. See radius.

noun. An ell; also, a yard.

noun. The bone of the forearm that extends from the elbow to the wrist on the side opposite to the thumb, corresponding to the fibula of the hind limb. Also, the corresponding bone in the forelimb of any vertebrate.

noun. the inner and longer of the two bones of the human forearm

"Plaque-clogged arteries in the abdomen suggest a red-meat eater; black-encrusted lungs signify long-term nicotine addiction; the faint indentation in the ulna is the scarred evidence of an arm broken in childhood."

radius  ridge) of the ulna  tubercle of the ulna  

ulnar  

arm bone  

Morse  avicularium  branchiæ  carpal  chamfer  

ell  

radius  ulnae