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Diameter

Definition: 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.

Diameter

Definition: A diametral plane.

Diameter

Definition: 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.

Diameter

Definition: 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.