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Definition of Diameter
1. Noun. The length of a straight line passing through the center of a circle and connecting two points on the circumference.
Terms within: R, Radius
Specialized synonyms: Bore, Caliber, Calibre, Gauge, Windage
Generic synonyms: Length
Derivative terms: Diametral, Diametric, Diametrical
2. Noun. A straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface).
Definition of Diameter
1. n. 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.
Definition of Diameter
1. a straight line passing through the center of a circle and ending at the periphery [n -S]
Medical Definition of Diameter
1. The length of a straight line passing through the centre of a circle and connecting opposite points on its circumference, hence the distance between two specified opposite points on the periphery of a structure such as the cranium or pelvis. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)