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a. A solid figure with a polygonal base and triangular faces that meet at a common point.
b. Something shaped like this polyhedron.
a. A massive monument of ancient Egypt having a rectangular base and four triangular faces culminating in a single apex, built over or around a crypt or tomb.
b. Any of various similar constructions, especially a four-sided Mesoamerican temple having stepped sides and a flat top surmounted by chambers.
3. The transactions involved in pyramiding stock.
4. Anatomy A structure or part suggestive of a pyramid in shape.
v. pyr·a·mid·ed, pyr·a·mid·ing, pyr·a·mids
1. To place or build in the shape of a pyramid.
2. To build (an argument or thesis, for example) progressively from a basic general premise.
3. To speculate in (stock) by making a series of buying and selling transactions in which paper profits are used as margin for buying more stock.
1. To assume the shape of a pyramid.
2. To increase rapidly and on a widening base.
3. To pyramid stocks.

[Latin pȳramis, pȳramid-, from Greek pūramis, of unknown origin.]

py·ram′i·dal (pĭ-răm′ĭ-dl), pyr′a·mid′ic (-mĭd′ĭk), pyr′a·mid′i·cal (-ĭ-kəl) adj.
py·ram′i·dal·ly adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Izaki, "Effect of oxide intermediate layers on pyramidally textured Cu2O/ ZnO solar cells prepared by electrodeposition," ECS Meeting Abstracts, vol.
So we can unproblematically blame the blind man for choosing to drive, the college student for choosing not to set his alarm clock before an exam, the schizophrenic for not taking her anti-psychotic medications, and Farmer Menlove for choosing to ignore his wise neighbor who warned of damp hay's propensity for spontaneous combustion when stacked pyramidally. But this simply reflects the principle that we can blame people for their choices; it does not mean that we can blame them for the failings whose effects they ought to choose to mitigate when possible.
The most important special case of solvable TSP is so-called pyramidally solvable TSPs.