Di*am"e*ter (?), n. [F. diametre, L. diametros, fr. Gr. ; 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.
A diametral plane.
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.
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.
© Webster 1913.