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pyramid

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Pyramid \Pyr"a*mid\, verb (used without an object) (Speculation) To enlarge one's holding or interest in a series of operations on a continued rise or decline by using the profits to buy or sell additional amounts on a margin, as 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. A similar process of reinvesting gains or winnings (as of a gamble), but not involving operation on margin, is called a {parlay}. [Webster 1913 Suppl. +PJC]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Pyramid \Pyr"a*mid\, verb (used with an object) (Speculation) To use, or to deal in, in a pyramiding transaction. See {Pyramid}, verb (used without an object) [Webster 1913 Suppl.]

From The Collaborative International Dictionary of English v.0.48 [gcide]:

Pyramid \Pyr"a*mid\, noun [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.

From WordNet (r) 3.0 (2006) [wn]:

noun

3: a massive monument with a square base and four triangular sides; begun by Cheops around 2700 BC as royal tombs in ancient Egypt [syn: {Pyramid}, {Great Pyramid}, {Pyramids of Egypt}]

verb

2: use or deal in (as of stock or commercial transaction) in a pyramid deal

3: arrange or build up as if on the base of a pyramid