- noun a solid of which each side is a triangle, with either a square or triangular base
- noun a hierarchical staff structure in an organisation, with few employees at the top and many more at the bottom
- noun a shape like a triangle with a wide bottom rising to a point at the top
- noun a cone-shaped part of the body, especially a cone-shaped projection on the surface of the medulla oblongata or in the medulla of the kidney.
Origin & History of “pyramid”
Egypt seems a likely ultimate source for pyramid, but its earliest known ancestor is Greek puramís, which passed into English via Latin pyramis. Pediment ‘triangular gable’ (17th c.) probably originated as a garbling of pyramid, later influenced by ped-, the stem of Latin pēs ‘foot’.