pyramid

1. 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. (countable, uncountable)
2. A construction in the shape of a pyramid, usually with a square or rectangular base. (countable, uncountable)
3. A solid with triangular lateral faces and a polygonal (often square or rectangular) base. (countable, uncountable)
4. Any structure or diagram with many members at the bottom and progressively fewer towards the top. (countable, uncountable) · The company was organized as a pyramid, with a CEO in charge of four directors, each heading up a department.
5. A medullary pyramid, the medial-most bumps on the ventral side of the medulla oblongata (countable, uncountable)
6. A pyramid scheme. (countable, uncountable)
7. The triangular layout of cards in the game of Pyramid. (countable, uncountable) · Build your pyramid with all cards face down, except the cards in the bottom row.
8. An approximately triangular headline consisting of several centered lines of text of increasing length. (countable, uncountable)

Plural pyramids