Crossword Genius

Lines in circles (5)

Ross

I believe the answer is:

radii

'lines in circles' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for radii that I've seen before include "Lines drawn from a circle's centre" , "Lines from centre to perimeter of a circle" , "Spokes of wheel - bones of arm" , "Lines from the centre to the circumference of a circle" , "Veins of insect's wings" .)

I've seen this clue in The Globe and Mail and the Universal.
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