Pyramid

Noun

 * 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) A construction in the shape of a pyramid, usually with a square or rectangular base.
 * 3)  A solid with triangular lateral faces and a polygonal (often square or rectangular) base.
 * 4) A pyramid scheme.

Derived terms

 * pyramidal
 * pyramidism
 * pyramidize
 * pyramidologist
 * pyramidology
 * pyramid scheme

Thesaurus
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Alternative forms

 * piramis