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English definition of “pyramid”

pyramid

noun [C]  /ˈpɪr·əˌmɪd/ us  
geometry a solid shape with a flat, square base and four flat, triangular sides which slope inward and meet to form a point at the top A pyramid is also a pile of things that has a triangular shape: The acrobats formed a pyramid by standing on each other’s shoulders. biology A pyramid is also a representation of a system with more items at the bottom and fewer at the top, for example, of the effect that one living thing has on another in the food chain.
(Definition of pyramid from the Cambridge Academic Content Dictionary © Cambridge University Press)
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