pyramid

/ˈpɪɹəmɪd/
noun
  1. 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.

  2. 2

    A construction in the shape of a pyramid, usually with a square or rectangular base.

  3. 3

    A solid with triangular lateral faces and a polygonal (often square or rectangular) base.

  4. 4

    A medullary pyramid, the medial-most bumps on the ventral side of the medulla oblongata

  5. 5

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

  6. 6

    A pyramid scheme.

  7. 7

    Alternative letter-case form of Pyramid. (a solitaire card game)

  8. 8

    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.

  9. 9

    An approximately triangular headline consisting of several centered lines of text of increasing length.

verb
  1. 1

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

  2. 2

    To combine (a series of genes) into a single genotype.

  3. 3

    To employ, or take part in, a pyramid scheme.

  4. 4

    To engage in pyramid trading.

Source: https://en.wiktionary.org/wiki/pyramid