Definition of ulna noun from the Oxford Advanced Learner's Dictionary

 

ulna

 noun
noun
BrE BrE//ˈʌlnə//
 
; NAmE NAmE//ˈʌlnə//
 
(pl. ulnae
BrE BrE//ˈʌlniː//
 
; NAmE NAmE//ˈʌlniː//
 
)
(anatomy) Skeleton and muscles
 
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the longer bone of the two bones in the lower part of the arm between the elbow and the wrist, on the side opposite the thumb see also radius (3) See related entries: Skeleton and muscles Word Origin late Middle English (denoting the humerus bone): from Latin; related to ell.
See the Oxford Advanced American Dictionary entry: ulna