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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.
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. 2015.
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British Dictionary definitions for ulnae


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 ulnae



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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ulnae 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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ulnae 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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Encyclopedia Article for ulnae


inner of two bones of the forearm when viewed with the palm facing forward. (The other, shorter bone of the forearm is the radius.) The upper end of the ulna presents a large C-shaped notch-the semilunar, or trochlear, notch-which articulates with the trochlea of the humerus (upper arm bone) to form the elbow joint. The projection that forms the upper border of this notch is called the olecranon process; it articulates behind the humerus in the olecranon fossa and may be felt as the point of the elbow. The projection that forms the lower border of the trochlear notch, the coronoid process, enters the coronoid fossa of the humerus when the elbow is flexed. On the outer side is the radial notch, which articulates with the head of the radius. The head of the bone is elsewhere roughened for muscle attachment. The shaft is triangular in cross section; an interosseous ridge extends its length and provides attachment for the interosseous membrane connecting the ulna and the radius. The lower end of the bone presents a small cylindrical head that articulates with the radius at the side and the wrist bones below. Also at the lower end is a styloid process, medially, that articulates with a disk between it and the cuneiform (os triquetrum) wrist bone.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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