Lines from the centre to the perimeter of a circle (5)

I believe the answer is:

radii

(Other definitions for radii that I've seen before include "Veins of insect's wings" , "Two making up diameter" , "parts for arms" , "Halves of diameters" , "Lines from the centre to the circumference of a circle" .)

I've seen this clue in the Sydney Morning Herald.

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