Diameters
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(the length of) a straight line that reaches from one point on the edge of a round shape or object, through its centre, to a point on the opposite edge:
Diameters meaning & definition 1 of Diameters.
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the distance from one side to the opposite side of a circle, measured by a line passing through the center of the circle:
Diameters meaning & definition 2 of Diameters.