Axis of a pyramid
Pyramid Pyr"a*mid, n. [L. pyramis, -idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 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. [1913 Webster]

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. [1913 Webster]

3. pl. (Billiards) The game of pool in which the balls are placed in the form of a triangle at spot. [Eng.] [1913 Webster]

4. (Finance) a fraudulent investment scheme in which the manager promises high profits, but instead of investing the money in a genuine profit-making activity, uses the money from later investors to pay the profits to earlier investors; -- also called {pyramid scheme} or {pyramid operation}. This process inevitably collapses when insufficient new investors are available, leaving the later investors with total or near-total losses of their investments. The managers usually blame government regulations or interference for the collapse of the scheme, rather than admit fraud. [PJC]

{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. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • Altitude of a pyramid — Pyramid Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or… …   The Collaborative International Dictionary of English

  • Pyramid — Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 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… …   The Collaborative International Dictionary of English

  • pyramid operation — Pyramid Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or… …   The Collaborative International Dictionary of English

  • pyramid scheme — Pyramid Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or… …   The Collaborative International Dictionary of English

  • pyramid — I. noun Etymology: Latin pyramid , pyramis, from Greek Date: 1549 1. a. an ancient massive structure found especially in Egypt having typically a square ground plan, outside walls in the form of four triangles that meet in a point at the top, and …   New Collegiate Dictionary

  • Pyramid of Djoser — Djoser Constructed 2667–2648 BC …   Wikipedia

  • Pyramid Technology — was a computer company that produced a number of RISC based minicomputers at the upper end of the performance range. They also became the second company to ship a multiprocessor Unix system (branded OS/x), in 1985, which formed the basis of their …   Wikipedia

  • Earth pyramid — Pyramid Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or… …   The Collaborative International Dictionary of English

  • Right pyramid — Pyramid Pyr a*mid, n. [L. pyramis, idis, fr. Gr. ?, ?, of Egyptian origin: cf. F. pyramide.] [1913 Webster] 1. A solid body standing on a triangular, square, or polygonal base, and terminating in a point at the top; especially, a structure or… …   The Collaborative International Dictionary of English

  • Population pyramid — This distribution is named for the frequently pyramidal shape of its graph. A population pyramid, also called an age structure diagram, is a graphical illustration that shows the distribution of various age groups in a population (typically that… …   Wikipedia

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