Definitions
from The Century Dictionary.
- Pertaining to a pyramid, or having its form. Also
pyramidical . - In bot., anat., and zoology, shaped more or less like a pyramid; conical; pyriform.
- In anatomy, noting a muscle whose fibers arise from a long base and converge to the point of their insertion: correlative with
prismatic , 3, andrhomboidal , 2.
from the GNU version of the Collaborative International Dictionary of English.
- adjective Of or pertaining to a pyramid; in the form of a a pyramid; pyramidical.
- adjective (Crystallog.) Same as
Tetragonal . - adjective (Math.) certain series of figurate numbers expressing the number of balls or points that may be arranged in the form of pyramids. Thus 1, 4, 10, 20, 35, etc., are
triangular pyramidal numbers ; and 1, 5, 14, 30, 55, etc., aresquare pyramidal numbers . - noun (Anat.) One of the carpal bones. See
cuneiform , n., 2 (b).
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geometry
Pyramid -shaped. - noun anatomy One of the
carpal bones.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adjective resembling a pyramid
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Examples
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We loved the presentation on the rice in pyramidal form.
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It is often called the pyramidal or fastigiate poplar.
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These are called pyramidal cells (from their shape), or Betz cells (after the Russian anatomist Vladimir Betz, who first described them in 1874).
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The fibers from the motor area form into a bundle called the pyramidal tract, or pyramidal system.
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A third lobe, of conical shape, called the pyramidal lobe, frequently arises from the upper part of the isthmus, or from the adjacent portion of either lobe, but most commonly the left, and ascends as far as the hyoid bone.
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When these pyramidal fibers are traced downward it is found that some two-thirds or more of them leave the pyramids in successive bundles, and decussate in the anterior median fissure, forming what is termed the pyramidal decussation.
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They are ordinarily called pyramidal or fastigiate forms, and as far as their history goes, they arise suddenly in large sowings of the normal species.
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The same want was met in Yucatan and Chiapas by a new expedient namely a pyramidal platform or elevation of earth twenty, thirty and forty feet high upon the level summits of which their great houses were erected.
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Scottish ell -- as in recent times the divine origin of the so-called pyramidal cubit and inch -- was pleaded rather strenuously.
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Most of the neurons within a column, and therefore within the cortex as a whole, are so-called pyramidal neurons, whose output excites the cell it synapses with.
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