From The Collaborative International Dictionary of English v.0.48 [gcide]:
1. (Geom.) (a) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the opposite boundaries; a straight line which bisects a system of parallel chords drawn in a curve. (b) A diametral plane.
From WordNet (r) 3.0 (2006) [wn]:
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