Crossword Genius

Arm bones (5)

Ross

I believe the answer is:

radii

'arm bones' is the definition.
(radius is a kind of arm bone)

This is the entire clue.

(Other definitions for radii that I've seen before include "Halves of diameter" , "parts for arms" , "Straight lines from the centre to the surface of a sphere" , "Spokes of wheel - bones of arm" , "They meet in the middle of a circle" .)

I've seen this clue in the King Feature Syndicate, the LA Times, The Sun, The New York Times, The Guardian and The Wall Street Journal.
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