Crossword Genius

Half-diameters (5)

Ross

I believe the answer is:

radii

'half-diameters' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for radii that I've seen before include "parts for arms" , "Spokes of a circle" , "Veins of insect's wings" , "Lines between the center and circumference of a circle" , "Half diameters" .)

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