Pyramid

n. geometric figure with a polygonal base and sides which are isosceles triangles; structure in which ancient Egyptians buried their kings

v. become more expensive, increase in price; build a pyramid, arrange in the shape of a pyramid

For other meanings, see pyramid (disambiguation). A pyramid is any three-dimensional structure where the upper surfaces are triangular and converge on one point (apex). The base of pyramids are usually quadrilateral or trilateral (but generally may be of any polygon shape), meaning that a pyramid usually has four or three sides. The measurements of these triangles uniformly classify the shape as isosceles and sometimes equilateral.
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Pyramid /pyr·a·mid/ a pointed or cone-shaped structure or part; often used to indicate the pyramid of the medulla oblongata. [more]Pyramid - Community and Resources

Noun
1. a massive memorial with a square base and four triangular sides; built as royal tombs in ancient Egypt
(synonym) Great Pyramid
(hypernym) memorial, monument

Noun
1. a polyhedron having a polygonal base and triangular sides with a common vertex
(hypernym) polyhedron
2. (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases
(hypernym) speculation, venture
(classification) stock exchange, stock market, securities market
Verb
1. enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts
(hypernym) profit, gain, benefit
(classification) investing, investment
2. use or deal in (as of stock or commercial transaction) in a pyramid deal
(hypernym) deal, sell, trade
(classification) crime, law-breaking
3. arrange or build up as if on the base of a pyramid
(hypernym) arrange, set up
(derivation) Pyramid, Great Pyramid
4. increase rapidly and progressively step by step on a broad base
(hypernym) increase

(n.)
The game of pool in which the balls are placed in the form of a triangle at spot.
  

(n.)
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.
  

(n.)
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.