pyramid definition | Dictionary.com

pyr⋅a⋅mid

[pir-uh-mid]

–noun

Architecture.

a.	(in ancient Egypt) a quadrilateral masonry mass having smooth, steeply sloping sides meeting at an apex, used as a tomb.

b.	(in ancient Egypt and pre-Columbian Central America) a quadrilateral masonry mass, stepped and sharply sloping, used as a tomb or a platform for a temple.

2.	anything of such form.

3.	a number of persons or things arranged or heaped up in this manner: a pyramid of acrobats; a pyramid of boxes.

4.	a system or structure resembling a pyramid, as in hierarchical form.

5.	Geometry. a solid having a polygonal base, and triangular sides that meet in a point.

6.	Crystallography. any form the planes of which intersect all three of the axes.

7.	Anatomy, Zoology. any of various parts or structures of pyramidal form.

8.	Also called pyramid scheme. a scheme that pyramids, as in speculating on the stock exchange or writing a chain letter.

9.	a tree pruned or trained to grow in conical form.

10.	pyramids, (used with a singular verb) British. a form of pocket billiards for two or four players in which 15 colored balls, initially placed in the form of a triangle, are pocketed with one white cue ball.

–verb (used without object)

11.	to take, or become disposed in, the form of a pyramid.

12.	Stock Exchange. (in speculating on margin) to enlarge one's operations in a series of transactions, as on a continued rise or decline in price, by using profits in transactions not yet closed, and consequently not yet in hand, as margin for additional buying or selling in the next transaction.

13.	to increase gradually, as with the completion of each phase: Our problems are beginning to pyramid.

–verb (used with object)

14.	to arrange in the form of a pyramid.

15.	to raise or increase (costs, wages, etc.) by adding amounts gradually.

16.	to cause to increase at a steady and progressive rate: New overseas markets have pyramided the company's profits.

17.	Stock Exchange. (in speculating on margin) to operate in, or employ in, pyramiding.

Origin:
1350–1400; < L pȳramid- (s. of pȳramis) < Gk pȳramís; r. ME pyramis < L, as above

Related forms:

pyr⋅a⋅mid⋅like, adjective

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Link To pyramid

pyr·a·mid (pĭr'ə-mĭd)

1. A solid figure with a polygonal base and triangular faces that meet at a common point.
2. Something shaped like this polyhedron.
3. A massive monument of ancient Egypt having a rectangular base and four triangular faces culminating in a single apex, built over or around a crypt or tomb.
4. Any of various similar constructions, especially a four-sided Mesoamerican temple having stepped sides and a flat top surmounted by chambers.
1. A massive monument of ancient Egypt having a rectangular base and four triangular faces culminating in a single apex, built over or around a crypt or tomb.
2. Any of various similar constructions, especially a four-sided Mesoamerican temple having stepped sides and a flat top surmounted by chambers.
The transactions involved in pyramiding stock.
Anatomy A structure or part suggestive of a pyramid in shape.

v. pyr·a·mid·ed, pyr·a·mid·ing, pyr·a·mids

v. tr.

To place or build in the shape of a pyramid.
To build (an argument or thesis, for example) progressively from a basic general premise.
To speculate in (stock) by making a series of buying and selling transactions in which paper profits are used as margin for buying more stock.

v. intr.

To assume the shape of a pyramid.
To increase rapidly and on a widening base.
To pyramid stocks.

[Latin pȳramis, pȳramid-, from Greek pūramis, probably of Egyptian origin.]
py·ram'i·dal (pĭ-rām'ĭ-dl), pyr'a·mid'ic (-mĭd'ĭk), pyr'a·mid'i·cal (-ĭ-kəl) adj., py·ram'i·dal·ly adv.

The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Pyramid

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 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.

Pyramid

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

Pyramid

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

Pyramid

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.

Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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Language Translation for : pyramid

Spanish: pirámide,

German: die Pyramide,

Japanese: 角錐形のもの

More Translations »

pyramid

1552 (earlier in L. form piramis, 1398), from Fr. pyramide (O.Fr. piramide, 12c.), from L. pyramides, pl. of pyramis "one of the pyramids of Egypt," from Gk. pyramis (pl. pyramides), apparently an alteration of Egyptian pimar "pyramid."

pyramid

A classic investment fraud in which the operator pays promised high returns to current investors from the contributions made by new investors. Thus, funds are never invested in any productive assets but are simply paid out as a return to existing owners. The operator must continue to attract more and more investors in order to pay a return to those who have already committed their funds. Also called Ponzi scheme.

pyramid

To use profits derived from a profitable security position in combination with borrowed money in order to acquire an even larger investment position. Pyramiding, which is very risky, allows an investor the possibility of greater profits by using a given amount of funds to control the maximum amount of securities.

Main Entry: pyr·a·mid
Pronunciation: 'pir-&-"mid
Function: noun
1 : a group of holding companies superimposed on one another to give those in control of the top holding company control over all of the companies with a small investment
2 : the series of operations involved in pyramiding on an exchange
3 : a pyramid scheme

Main Entry: pyramid
Function: intransitive verb
: to speculate (as on a security or commodity exchange) by using paper profits as a margin for additional transactions transitive verb 1 : to use (as profits) in speculative pyramiding
2 : to increase the impact of (as a tax assessed at the production level) on the ultimate consumer by treating as a cost subject to markup

Main Entry: pyramid
Function: adjective
: of, relating to, or being an illegal scheme in which participants give money or other valuables in exchange for the opportunity to receive payment for recruiting others to participate in the scheme

Main Entry: pyr·a·mid
Pronunciation: 'pir-&-"mid
Function: noun
1 : a polyhedron having for its base a polygon and for facestriangles with a common vertex
2 : an anatomical structure resembling a pyramid: as a : RENALPYRAMID b : either of two large bundles of motor fibers from the cerebral cortex that reach the medulla oblongata and are continuous with the corticospinal tracts of thespinal cord c : a conical projection making up the central part of the inferior vermis of the cerebellum

pyramid pyr·a·mid (pĭr'ə-mĭd)
n.

A solid figure with a polygonal base and triangular faces that meet at a common point.
A structure or part shaped like a pyramid.

py·ram'i·dal (pĭ-rām'ĭ-dl) adj.

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