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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.
References in periodicals archive ?
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.
The most important special case of solvable TSP is so-called pyramidally solvable TSPs.
The acinar cells are pyramidally shaped epithelial cells that are radially oriented around a central lumen.