Definitions for: Diameter

[n] the length of a straight line passing through the center of a circle and connecting two points on the circumference
[n] 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)

Webster (1913) Definition: Di*am"e*ter, n. [F. diam[`e]tre, 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.

Note: In an elongated object the diameter is usually taken at
right angles to the longer axis.

3. (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.

Synonyms: diam

See Also: bore, caliber, calibre, length, r, radius, straight line, windage

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