Dictionary

pyramid

1pyramid

noun pyr·a·mid \ˈpir-ə-ˌmid\

: a very large structure built especially in ancient Egypt that has a square base and four triangular sides which form a point at the top

: a shape, object, or pile that is wide near the bottom and narrows gradually as it reaches the top

: something that resembles a pyramid in the way its parts are arranged or organized

Full Definition of 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 form
2
:  a polyhedron having for its base a polygon and for faces triangles with a common vertex — see volume table
3
:  a crystalline form each face of which intersects the vertical axis and either two lateral axes or in the tetragonal system one lateral axis
4
:  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 \pə-ˈra-mə-dəl, ˌpir-ə-ˈmi-\ adjective
py·ra·mi·dal·ly adverb
pyr·a·mid·i·cal \ˌpir-ə-ˈmi-di-kəl\ adjective

Examples of PYRAMID

  1. the ancient pyramids of Egypt

Illustration of PYRAMID

Origin of PYRAMID

Latin pyramid-, pyramis, from Greek
First Known Use: 1549

Other Archaeology Terms

Attic, Byzantine, Paleolithic, cairn, core, flint, horizon, neolithic, shard, stratum

2pyramid

verb

Definition of PYRAMID

intransitive verb
1
:  to speculate (as on a security or commodity exchange) by using paper profits as margin for additional transactions
2
:  to increase rapidly and progressively step by step on a broad base
transitive verb
1
:  to arrange or build up as if on the base of a pyramid
2
:  to use (as profits) in speculative pyramiding
3
:  to increase the impact of (as a tax assessed at the production level) on the ultimate consumer by treating as a cost subject to markup

First Known Use of PYRAMID

circa 1900

pyramid

noun pyr·a·mid \ˈpir-ə-ˌmid\   (Medical Dictionary)

Medical Definition of PYRAMID

1
:  a polyhedron having for its base a polygon and for faces triangles with a common vertex
2
:  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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