Definition of ulna noun from the Oxford Advanced American Dictionary

 

ulna

 noun
noun
NAmE//ˈʌlnə//
 
(pl. ulnae
NAmE//ˈʌlni//
 
)
(anatomy)
 
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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
See the Oxford Advanced Learner's Dictionary entry: ulna