|1.||a huge masonry construction that has a square base and, as in the case of the ancient Egyptian royal tombs, four sloping triangular sides|
|2.||an object, formation, or structure resembling such a construction|
|3.||maths a solid having a polygonal base and triangular sides that meet in a common vertex|
|4.||crystallog a crystal form in which three planes intersect all three axes of the crystal|
|5.||anatomy any pointed or cone-shaped bodily structure or part|
|6.||finance a group of enterprises containing a series of holding companies structured so that the top holding company controls the entire group with a relatively small proportion of the total capital invested|
|7.||chiefly (US) the series of transactions involved in pyramiding securities|
|8.||(plural) a game similar to billiards with fifteen coloured balls|
|9.||to build up or be arranged in the form of a pyramid|
|10.||chiefly (US) to speculate in (securities or property) by increasing purchases on additional margin or collateral derived from paper profits associated with high prices of securities and property in a boom|
|11.||finance to form (companies) into a pyramid|
|[C16 (earlier pyramis): from Latin pyramis, from Greek puramis, probably from Egyptian]|
pyramid pyr·a·mid (pĭr'ə-mĭd)
A solid figure with a polygonal base and triangular faces that meet at a common point.
A structure or part shaped like a pyramid.
A group of huge monuments in the desert of Egypt, built as burial vaults for ancient Egyptian kings. The age of pyramid building in Egypt began about 2700 b.c. (See under “World History to 1550.”)
A group of huge monuments in the Egyptian desert, built as burial vaults for the pharaohs and one of the Seven Wonders of the Ancient World. The pyramids have square bases and four triangular faces. Pyramid building began in Egypt about 2700 b.c. and required vast amounts of slave labor.
British pocket-billiards game in which 15 red balls are arranged in a pyramid formation to begin. Players use a white cue ball in attempting to pocket the reds, scoring one point for each; the player who scores the highest number of pocketed balls is the winner. Players lose a point and respot a red ball each time they pocket the cue ball or fail to contact a red ball. A player shoots until he fails to pocket a ball, and an opponent then continues play from the point at which the cue ball comes to rest. Pyramids was a forerunner of the game snooker.
Learn more about pyramids with a free trial on Britannica.com.