PYRAMIDES

Noun

pyramides

plural of pyramide

plural of pyramis

Source: Wiktionary

PYRAMID

Pyr"a*mid, n. Etym: [L. pyramis, -idis, fr. Gr. pyramide.]

1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or edifice of this shape.

2. (Geom.)

Definition: A solid figure contained by a plane rectilineal figure as base and several triangles which have a common vertex and whose bases are sides of the base.

3. pl. (Billiards)

Definition: The game of pool in which the balls are placed in the form of a triangle at spot. [Eng.] Altitude of a pyramid (Geom.), the perpendicular distance from the vertex to the plane of the base.

– Axis of a pyramid (Geom.), a straight line drawn from the vertex to the center of the base.

– Earth pyramid. (Geol.) See Earth pillars, under Earth.

– Right pyramid (Geom.) a pyramid whose axis is perpendicular to the base.