Crossword Genius

Arm bones (5)

Ross

I believe the answer is:

radii

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arm bones</span>' is the definition.<br/ ><span class="explanation-format__explanation">(radius is a kind of arm bone)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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 Sun, The New York Times, the King Feature Syndicate, The Guardian, The Wall Street Journal and the LA Times.
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