Wheel spokes, for instance (5)

I believe the answer is:

radii

(Other definitions for radii that I've seen before include "Lines between the center and circumference of a circle" , "Straight lines from centre of a circle" , "Two making up diameter" , "Half-diameters" , "Lines from a circle's centre to the circumference" .)

I've seen this clue in the Newsday.

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