Crossword Genius

Radius neighbor (4)

Ross

I believe the answer is:

ulna

'radius neighbor' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ulna that I've seen before include "structural member?" , "Uneven" , "a section of framework" , "part of anatomy" , "Part of bone-structure" .)

I've seen this clue in the Penny Press, the King Feature Syndicate, The Wall Street Journal, the Universal and the LA Times.
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