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Pyramidical
a.
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Of or pertaining to a pyramid; having the form of a pyramid; pyramidal.
Pyramidia
pl.
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of Pyramidion
Pyramidion
n.
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The small pyramid which crowns or completes an obelisk.
Pyramidoid
n.
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A solid resembling a pyramid; -- called also pyramoid.
Pyramides
pl.
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of Pyramis
Pyramis
n.
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A pyramid.
Pyramoid
n.
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See Pyramidoid.
Pyrargyrite
n.
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Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.
Pyre
n.
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A funeral pile; a combustible heap on which the dead are burned; hence, any pile to be burnt.
Pyrenae
pl.
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of Pyrena
Pyrena
n.
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A nutlet resembling a seed, or the kernel of a drupe.
Pyrene
n.
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One of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, C16H10.
Pyrene
n.
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Same as Pyrena.
Pyrenean
a.
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Of or pertaining to the Pyrenees, a range of mountains separating France and Spain.
Pyrenean
n.
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The Pyrenees.
Pyrenoid
n.
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A transparent body found in the chromatophores of certain Infusoria.
Pyrethrin
n.
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A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.
Pyrethrine
n.
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An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum).
Pyretic
a.
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Of or pertaining to fever; febrile.
Pyretology
n.
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A discourse or treatise on fevers; the doctrine of fevers.
Pyrexiae
pl.
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of Pyrexia
Pyrexia
n.
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The febrile condition.
Pyrexial
a.
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Alt. of Pyrexical
Pyrexical
a.
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Of or pertaining to fever; feverish.
Pyrgom
n.
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A variety of pyroxene; -- called also fassaite.
Pyrheliometer
n.
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An instrument for measuring the direct heating effect of the sun's rays.
Pyridic
a.
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Related to, or formed from, pyridin or its homologues; as, the pyridic bases.
Pyridine
n.
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A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptomaines, may be mentioned. See Lutidine.
Pyridyl
n.
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A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl.
Pyriform
a.
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Having the form of a pear; pear-shaped.