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Psychozoic
a.
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Designating, or applied to the Era of man; as, the psychozoic era.
Psychrometer
n.
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An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.
Psychrometrical
a.
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Of or pertaining to the psychrometer or psychrometry.
Psychrometry
n.
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Hygrometry.
Psyllae
pl.
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of Psylla
Psylla
n.
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Any leaping plant louse of the genus Psylla, or family Psyllidae.
Ptarmigan
n.
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Any grouse of the genus Lagopus, of which numerous species are known. The feet are completely feathered. Most of the species are brown in summer, but turn white, or nearly white, in winter.
Ptenoglossa
n. pl.
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A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.
Ptenoglossate
a.
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Of or pertaining to the Ptenoglossa.
Pteranodon
n.
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A genus of American Cretaceous pterodactyls destitute of teeth. Several species are known, some of which had an expanse of wings of twenty feet or more.
Pteranodontia
n. pl.
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A group of pterodactyls destitute of teeth, as in the genus Pteranodon.
Pterichthys
n.
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A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See Placodermi.
Pteridologist
n.
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One who is versed in pteridology.
Pteridology
n.
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That department of botany which treats of ferns.
Pteridomania
n.
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A madness, craze, or strong fancy, for ferns.
Pteridophyta
n. pl.
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A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia.
Pterobranchia
n. pl.
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An order of marine Bryozoa, having a bilobed lophophore and an axial cord. The genus Rhabdopleura is the type. Called also Podostomata. See Rhabdopleura.
Pteroceras
n.
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A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.
Pterocletes
n. pl.
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A division of birds including the sand grouse. They are in some respects intermediate between the pigeons and true grouse. Called also Pteroclomorphae.
Pterodactyl
n.
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An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.
Pterodactyli
n. pl.
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Same as Pterosauria.
Pteroglossal
a.
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Having the tongue finely notched along the sides, so as to have a featherlike appearance, as the toucans.
Pteron
n.
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The region of the skull, in the temporal fossa back of the orbit, where the great wing of the sphenoid, the temporal, the parietal, and the frontal hones approach each other.
Pteropappi
n. pl.
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Same as Odontotormae.
Pterophore
n.
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Any moth of the genus Pterophorus and allied genera; a plume moth. See Plume moth, under Plume.
Pteropod
n.
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One of the Pteropoda.
Pteropoda
n. pl.
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A class of Mollusca in which the anterior lobes of the foot are developed in the form of broad, thin, winglike organs, with which they swim at near the surface of the sea.
Pteropodous
a.
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Of or pertaining to the Pteropoda.
Pterosaur
n.
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A pterodactyl.
Pterosauria
n. pl.
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An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria.