noun
ulna
UHL-nuh
noun
1
The long bone of the forearm running from the elbow to the wrist, on the side opposite the thumb.
"The X-ray revealed a hairline fracture in the ulna."
How to Use Ulna
Learner’s notesIn plain EnglishOne of the two forearm bones — the one on the little-finger side.
Common mistake
Easy to mix up with the radius, the other forearm bone, which sits on the thumb side.
Easily confused with
Word Forms
ulnae plural, ulnas plural
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The X-ray revealed a hairline fracture in the _____.
Etymology
From Latin "ulna", meaning "elbow" or "forearm".