- Anatomy. the bone of the forearm on the side opposite to the thumb.Compare radius(def 7).
- a corresponding bone in the forelimb of other vertebrates.
Origin of ulna
1835–45; < Latin: elbow; akin to Greek ōlénē, Old English eln ell2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for ulna
The ulna must then be cleared, and the triceps divided at its insertion.A Manual of the Operations of Surgery
Ulna, from the top of the shoulder or arme-hole, to the top of the middle finger.The Way To Geometry
The ends of the secondaries must not be separated from the bone of the forearm, or the ulna.Taxidermy and Zoological Collecting
William T. Hornaday
Its radius and ulna are separate bones, not fused as they are normally.
The ulna (fig. 57, 3) is longer, stouter, and slightly curved.The Vertebrate Skeleton
Sidney H. Reynolds
- the inner and longer of the two bones of the human forearm
- the corresponding bone in other vertebrates
C16: from Latin: elbow, ell 1
Word Origin and History for ulna
inner bone of the forearm, 1540s, Latin, literally "elbow;" related to Old English eln (see elbow (n.)).
Online Etymology Dictionary, © 2010 Douglas Harper
- The larger bone of the two bones of the forearm, extending from elbow to wrist on the side opposite the thumb.cubitus elbow bone
- The longer of the two bones of the forearm or lower portion of the foreleg. See more at skeleton.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.