# Definitions for: Pyramid

[n] a massive memorial with a square base and four triangular sides; built as royal tombs in ancient Egypt
[n] a polyhedron having a polygonal base and triangular sides with a common vertex
[v] increase rapidly and progressively step by step on a broad base
[v] arrange or build up as if on the base of a pyramid
[v] use or deal in (as of stock or commercial transaction) in a pyramid deal
[v] enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts

Webster (1913) Definition: Pyr"a*mid, v. i. (Speculation)
To enlarge one's holding or interest in a series of
operations on a continued rise or decline by using the
where one buys on a 10% margin 100 shares of stock quoted at
100, holds it till it rises to 105, and then uses the paper
profit to buy 50 shares more, etc. The series of operations
constitutes a pyramid.

Pyr"a*mid, v. t. (Speculation)
To use, or to deal in, in a pyramiding transaction. See
Pyramid, v. i.

Pyr"a*mid, n. (Speculation)
The series of operations involved in pyramiding. See
Pyramid, v. i.

Pyr"a*mid, n. [L. pyramis, -idis, fr. Gr. ?, ?, of
Egyptian origin: cf. F. 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.) 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) 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.