A straight line on a circle passing through the centre point (8)

I believe the answer is:

diameter

(Other definitions for diameter that I've seen before include "Straight line across circle passing through its centre" , "Calibre" , "It crosses the circle at its widest" , "A demerit for line bisecting a circle" , "Line crossing centre of sphere" .)

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

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