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pyramid
1 a: an ancient massive structure found especially in Egypt having typically a square ground plan, outside walls in the form of four triangles that meet in a point at the top, and inner sepulchral chambers b: a structure or object of similar form2: a polyhedron having for its base a polygon and for faces triangles with a common vertex
— see volume table3: a crystalline form each face of which intersects the vertical axis and either two lateral axes or in the tetragonal system one lateral axis4: an anatomical structure resembling a pyramid: as a: any of the conical masses that project from the renal medulla into the kidney pelvis b: either of two large bundles of motor fibers from the cerebral cortex that reach the medulla oblongata and are continuous with the pyramidal tracts of the spinal cord 5: an immaterial structure built on a broad supporting base and narrowing gradually to an apex <the socioeconomic pyramid>
— py·ra·mi·dal·ly adverb
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