pyramid

noun

1. (countable, uncountable)An ancient massive construction with a square or rectangular base and four triangular sides meeting in an apex, such as those built as tombs in Egypt or as bases for temples in Mesoamerica.
2. (countable, uncountable)A construction in the shape of a pyramid, usually with a square or rectangular base.

   “[T]he owners of Doddington Hall, in Lincolnshire, have brought the folly into the 21st century, by building a 30ft pyramid in the grounds of the Elizabethan manor.”

3. (countable, uncountable)A solid with triangular lateral faces and a polygonal (often square or rectangular) base.
4. (broadly, countable, uncountable)Any structure or diagram with many members at the bottom and progressively fewer towards the top.

   “The company was organized as a pyramid, with a CEO in charge of four directors, each heading up a department.”

   “They sit looking at the empty plate that had held a pyramid of sesame cakes. They have eaten them all.”

   “From there he headed down the leagues, but his love of the game trumped any pride about where he 'ought' to be playing as he racked up more than 1,000 games across the full length of the English pyramid.”

5. (countable, uncountable)A medullary pyramid, the medial-most bumps on the ventral side of the medulla oblongata
6. (UK, countable, dated, uncountable)The game of pool in which the balls are placed in the form of a triangle at spot.
7. (countable, uncountable)A pyramid scheme.
8. (alt-of, uncountable)Alternative letter-case form of Pyramid. (a solitaire card game)
9. (countable, uncountable)The triangular layout of cards in the game of Pyramid.

   “Build your pyramid with all cards face down, except the cards in the bottom row.”

10. (countable, uncountable)An approximately triangular headline consisting of several centered lines of text of increasing length.

    “[…] with a cross-line banner, a set of two-column pyramids beneath it in the middle, and on each side of these exactly the same thing,—something between a headline and a story—"$50,000 Reward for—" etc.”

verb

1. To build up or be arranged in the form of a pyramid.

   “The paint was stacked in neatly pyramided lots along the concrete floor.”

   “Once there was an enormous jukebox; the then-Harlettes (her three-woman back-up vocalists/dancers/mimes) pyramided to drop a huge coin, and around the bend of the big record would spin the diva.”

2. (transitive)To combine (a series of genes) into a single genotype.
3. (intransitive)To employ, or take part in, a pyramid scheme.
4. To engage in pyramid trading.

   “Multiply this by the number of shares you traded, and add other positions if you pyramided.”

5. (dated)To increase to or towards a peak.

name

1. A solitaire card game where the cards are arranged as a triangle (a "pyramid") and the object is to get the cards from the bottom to the top.