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See more synonyms for ulna on Thesaurus.com
noun, plural ul·nae [uhl-nee] /ˈʌl ni/, ul·nas.
  1. Anatomy. the bone of the forearm on the side opposite to the thumb.Compare radius(def 7).
  2. a corresponding bone in the forelimb of other vertebrates.
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Origin of ulna

1835–45; < Latin: elbow; akin to Greek ōlénē, Old English eln ell2
Related formsul·nar, adjectivepost·ul·nar, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words


Examples from the Web for ulna

Historical Examples

  • The ulna must then be cleared, and the triceps divided at its insertion.

    A Manual of the Operations of Surgery

    Joseph Bell

  • Ulna, from the top of the shoulder or arme-hole, to the top of the middle finger.

  • The ends of the secondaries must not be separated from the bone of the forearm, or the ulna.

  • 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

British Dictionary definitions for ulna


noun plural -nae (-niː) or -nas
  1. the inner and longer of the two bones of the human forearm
  2. the corresponding bone in other vertebrates
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Derived Formsulnar, adjective

Word Origin

C16: from Latin: elbow, ell 1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for ulna


inner bone of the forearm, 1540s, Latin, literally "elbow;" related to Old English eln (see elbow (n.)).

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Online Etymology Dictionary, © 2010 Douglas Harper

ulna in Medicine


n. pl. ul•nas
  1. The larger bone of the two bones of the forearm, extending from elbow to wrist on the side opposite the thumb.cubitus elbow bone
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Related formsulnar adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

ulna in Science


Plural ulnas ulnae (ŭl)
  1. The longer of the two bones of the forearm or lower portion of the foreleg. See more at skeleton.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.