Crossword Genius

Forearm bones

Ross

There are a few possibilities for this:

'forearm bones' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for radii that I've seen before include "Straight lines from centre of a circle" , "Half-diameters" , "Spokes of wheel - bones of arm" , "Straight lines from the centre to the surface of a sphere" , "more than one spoke" .)

I've seen this clue in The Wall Street Journal and the Sydney Morning Herald.
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