Vocabulary : Psychrometrical to Pterichthys
Psychrometrical : Of or pertaining to the psychrometer or psychrometry.
Psychrometry : Hygrometry.
Psylla : Any leaping plant louse of the genus Psylla, or family Psyllidae.
Psyllae : of Psylla
Ptarmigan : 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 : A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.
Ptenoglossate : Of or pertaining to the Ptenoglossa.
Pteranodon : 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 : A group of pterodactyls destitute of teeth, as in the genus Pteranodon.
Pterichthys : A genus of Devonian fossil fishes with winglike appendages. The head and most of the body were covered with large bony plates. See Placodermi.
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