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Medical Dictionary


noun pyr·a·mid \ˈpir-ə-ˌmid\

Medical Definition of PYRAMID

:  a polyhedron having for its base a polygon and for faces triangles with a common vertex
:  an anatomical structure resembling a pyramid: as a :  renal pyramid b :  either of two large bundles of motor fibers from the cerebral cortex that reach the medulla oblongata and are continuous with the corticospinal tracts of the spinal cord c :  a conical projection making up the central part of the inferior vermis of the cerebellum
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