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[uhl-nuh] /ˈʌl nə/
noun, plural ulnae
[uhl-nee] /ˈʌl ni/ (Show IPA),
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
Related forms
ulnar, adjective
postulnar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for ulna


noun (pl) -nae (-niː), -nas
the inner and longer of the two bones of the human forearm
the corresponding bone in other vertebrates
Derived Forms
ulnar, adjective
Word Origin
C16: from Latin: elbow, ell1
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
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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
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ulna in Medicine

ulna ul·na (ŭl'nə)
n. pl. ul·nas or ul·nae (-nē)
The larger bone of the two bones of the forearm, extending from elbow to wrist on the side opposite the thumb. Also called cubitus, elbow bone.

ul'nar adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ulna in Science
Plural ulnas or ulnae (ŭl'nē)
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 © 2002. Published by Houghton Mifflin. All rights reserved.
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