Crossword Genius

What the bottom of the triceps muscle connects to (4)

Ross

I believe the answer is:

ulna

(Other definitions for ulna that I've seen before include "Uneven" , "Thinner of two long bones in forearm" , "Thinner and longer of two bones in forearm" , "Radius partner" , "Part of body" .)

I've seen this clue in The New York Times.
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