Di*am"e*ter(?), n. [F. diamtre, L. diametros, fr. Gr. ; dia` through + measure. See Meter.] 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.
2. The length of a straight line through the center of an object from side to side; width; thickness; as, the
diameter of a tree or rock.
In an elongated object the diameter is usually taken at right angles to the longer axis.
(Arch.) The distance through the lower part of the shaft of a column, used as a standard measure for all parts of the order. See Module.
Conjugate diameters. See under Conjugate.
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Mon 10th December 2018