PPage 707
- English Word Psychosis Definition Any vital action or activity.
- English Word Psychosis Definition A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.
- English Word Psychozoic Definition Designating, or applied to the Era of man; as, the psychozoic era.
- English Word Psychrometer Definition An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.
- English Word Psychrometrical Definition Of or pertaining to the psychrometer or psychrometry.
- English Word Psychrometry Definition Hygrometry.
- English Word Psylla Definition Any leaping plant louse of the genus Psylla, or family Psyllidae.
- English Word Psyllae Definition of Psylla
- English Word Ptarmigan Definition 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.
- English Word Ptenoglossa Definition A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.
- English Word Ptenoglossate Definition Of or pertaining to the Ptenoglossa.
- English Word Pteranodon Definition 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.
- English Word Pteranodontia Definition A group of pterodactyls destitute of teeth, as in the genus Pteranodon.
- English Word Pterichthys Definition A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See Placodermi.
- English Word Pteridologist Definition One who is versed in pteridology.
- English Word Pteridology Definition That department of botany which treats of ferns.
- English Word Pteridomania Definition A madness, craze, or strong fancy, for ferns.
- English Word Pteridophyta Definition A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia.
- English Word Pterobranchia Definition An order of marine Bryozoa, having a bilobed lophophore and an axial cord. The genus Rhabdopleura is the type. Called also Podostomata. See Rhabdopleura.
- English Word Pteroceras Definition A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.