• WordNet 3.6
    • n ulna the inner and longer of the two bones of the human forearm
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Webster's Revised Unabridged Dictionary
    • Ulna (O. Eng. Law) An ell; also, a yard.
    • Ulna (Anat) The postaxial bone of the forearm, or brachium, corresponding to the fibula of the hind limb. See Radius.
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Century Dictionary and Cyclopedia
    • n ulna 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. The ulna is commonly the smaller one of the two bones, especially below, where its end is little more than a pivot for rotation of the wrist, the hand being almost entirely borne upon the end of the radius. In many animals the ulna is reduced by shortening, and in some it appears merely as a process of the radius, ankylosed upon the proximal end of the latter, as in bats, and in hoofed quadrupeds generally. In man, in animals generally which use their fore paws as hands, and in birds it is perfect, and extends the whole length of the forearm. Its proximal end has a large sigmoid cavity for articulation with the humerus, often a lesser sigmoid cavity for the head of the radius, and a prominent process, the olecranon, or head of the ulna, forming the greatest convexity of the back of the elbow. See cuts under carpus, Catarrhina, Elephantinæ, forearm, pinion, Plesiosaurus, and shoulder.
    • n ulna In entomology, the stigmatic or marginal vein of the fore wing.
    • n ulna A unit of length; a cubit; an ell.
    • n ulna In ichthyology, the hypereoracoid.
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Chambers's Twentieth Century Dictionary
    • n Ulna ul′na the inner and larger of the two bones of the forearm
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Webster's Revised Unabridged Dictionary
L., the elbow. See Ell
Chambers's Twentieth Century Dictionary
L. ulna; Eng. ell.


In literature:

A small portion of the skin below the articulation, with the ulna, remained intact.
"Anomalies and Curiosities of Medicine" by George M. Gould
The radius and ulna were separate, and the latter was entire through the whole length.
"A History of Science, Volume 3(of 5)" by Henry Smith Williams
The forearm contains two long bones, the ulna and the radius.
"A Practical Physiology" by Albert F. Blaisdell
Careful observation, however, enables us to distinguish in this bone a part which clearly answers to the upper end of the ulna.
"American Addresses, with a Lecture on the Study of Biology" by Thomas Henry Huxley
Fracture of the Ulna.
"Lameness of the Horse" by John Victor Lacroix
The ulna is complete and quite distinct from the radius, though firmly united with the latter.
"Lectures and Essays" by Thomas Henry Huxley
A fracture of the ulna alone is not of serious importance, except when the same conditions prevail.
"Special Report on Diseases of the Horse" by United States Department of Agriculture
Here's a femur; here's a radius-ulna.
"Attrition" by Jim Wannamaker
For some unexplained reason, a fracture of the upper third of the shaft of the ulna frequently fails to unite.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition." by Alexander Miles
The ulna is complete and quite distinct from that radius, though firmly united with the latter.
"Little Masterpieces of Science:" by Various

In news:

Two of these bones are from a cow, the radius and ulna.
Indians third baseman Lonnie Chisenhall is scheduled to have surgery next week to repair a broken ulna bone in his right forearm.