pyramidal

[pi-ram-i-dl]
adjective
1.
of, pertaining to, or shaped like a pyramid: the pyramidal form.
2.
of the nature of a pyramid; pyramidlike.

Origin:
1565–75; < Medieval Latin pȳramidālis; see pyramid, -al1

pyramidally, adverb
postpyramidal, adjective
subpyramidal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pyramid (ˈpɪrəmɪd)
 
n
1.  a huge masonry construction that has a square base and, as in the case of the ancient Egyptian royal tombs, four sloping triangular sides
2.  an object, formation, or structure resembling such a construction
3.  maths a solid having a polygonal base and triangular sides that meet in a common vertex
4.  crystallog a crystal form in which three planes intersect all three axes of the crystal
5.  anatomy any pointed or cone-shaped bodily structure or part
6.  finance a group of enterprises containing a series of holding companies structured so that the top holding company controls the entire group with a relatively small proportion of the total capital invested
7.  chiefly (US) the series of transactions involved in pyramiding securities
8.  (plural) a game similar to billiards with fifteen coloured balls
 
vb
9.  to build up or be arranged in the form of a pyramid
10.  chiefly (US) to speculate in (securities or property) by increasing purchases on additional margin or collateral derived from paper profits associated with high prices of securities and property in a boom
11.  finance to form (companies) into a pyramid
 
[C16 (earlier pyramis): from Latin pyramis, from Greek puramis, probably from Egyptian]
 
pyramidal
 
adj
 
pyra'midical
 
adj
 
pyra'midic
 
adj
 
py'ramidally
 
adv
 
pyra'midically
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
These tall, singular landforms are also called pyramidal peaks.
The only certainty for outside lenders and investors is that these pyramidal
  ownership structures are stacked against them.
Out of crushed bones and corrupted flesh a white, pyramidal hotel rose in
  balconied stages.
It is a natural consequence of the pyramidal shape of any human grouping since
  long.
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