Webster's Dictionary, 1913

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Psychian noun (Zoology) Any small moth of the genus Psyche and allied genera (family Psychidæ ). The larvæ are called basket worms . See Basket worm , under Basket .

Psychiatria, Psychiatry noun [ New Latin psychiatria , from Greek ... the mind + ... healing.] (Medicine) The application of the healing art to mental diseases. Dunglison.

Psychiatric adjective (Medicine) Of or pertaining to psychiatria.

Psychic, Psychical adjective [ Latin psychicus , Greek ..., from psychh` the soul, mind; confer ... to blow: confer French psychique .]
1. Of or pertaining to the human soul, or to the living principle in man.

» This term was formerly used to express the same idea as psychological . Recent metaphysicians, however, have employed it to mark the difference between psychh` the living principle in man, and pney^ma the rational or spiritual part of his nature. In this use, the word describes the human soul in its relation to sense, appetite, and the outer visible world, as distinguished from spiritual or rational faculties, which have to do with the supersensible world. Heyse.

2. Of or pertaining to the mind, or its functions and diseases; mental; -- contrasted with physical .

Psychical blindness , Psychical deafness (Medicine) , forms of nervous disease in which, while the senses of sight and hearing remain unimpaired, the mind fails to appreciate the significance of the sounds heard or the images seen. -- Psychical contagion , the transference of disease, especially of a functional nervous disease, by mere force of example. -- Psychical medicine , that department of medicine which treats of mental diseases.

Psychics noun Psychology.

Psychism noun [ Confer French psychisme .] (Philos.) The doctrine of Quesne, that there is a fluid universally diffused, end equally animating all living beings, the difference in their actions being due to the difference of the individual organizations. Fleming.

Psycho- A combining form from Greek psychh` the soul , the mind , the understanding ; as, psycho logy.

Psycho-motor adjective [ Psycho- + motor .] Of or pertaining to movement produced by action of the mind or will.

Psychoanalysis noun -- Psy`cho*an`a*lyt"ic adjective etc. = Psychanalysis , Psychanalytic .

Psychogenesis noun Genesis through an internal force, as opposed to natural selection .

Psychography noun [ Psycho- + -graphy .]
1. A description of the phenomena of mind.

2. (Spiritualism) Spirit writing.

Psychologic, Psychological adjective [ Confer French psychologique .] Of or pertaining to psychology. See Note under Psychic . -- Psy`cho*log"ic*al*ly , adverb

Psychologist noun [ Confer French psychologiste .] One who is versed in, devoted to, psychology.

Psychologue noun A psychologist.

Psychology noun plural Psychologies [ Psycho- + -logy : confer French psychologie . See Psychical .] The science of the human soul; specifically, the systematic or scientific knowledge of the powers and functions of the human soul, so far as they are known by consciousness; a treatise on the human soul.

Psychology , the science conversant about the phenomena of the mind, or conscious subject, or self.
Sir W. Hamilton.

Psychomachy noun [ Latin psychomachia , from Greek psychh` the soul + ... fight: confer ... desperate fighting.] A conflict of the soul with the body.

Psychomancy noun [ Psycho- + -mancy : confer French psychomancie .] Necromancy.

Psychometry noun [ Psycho- + -metry .] (Physiol.) The art of measuring the duration of mental processes, or of determining the time relations of mental phenomena. -- Psy`cho*met"ric adjective

Psychopannychism noun [ Psycho- + Greek ... to spend all night long; ..., ..., all + ... night.] (Theol.) The doctrine that the soul falls asleep at death, and does not wake until the resurrection of the body. -- Psy`cho*pan"ny*chism noun

Psychopathy noun [ Psycho- + Greek ..., ....] (Medicine) Mental disease. See Psychosis , 2. -- Psy`cho*path"ic , adjective -- Psy*chop"a*thist , noun

Psychophysical adjective Of or pertaining to psychophysics; involving the action or mutual relations of the psychical and physical in man.

Psychophysical time (Physiol.) , the time required for the mind to transform a sensory impression into a motor impulse. It is an important part of physiological or reaction time . See under Reaction .

Psychophysics noun [ Psycho- + physics .] The science of the connection between nerve action and consciousness; the science which treats of the relations of the psychical and physical in their conjoint operation in man; the doctrine of the relation of function or dependence between body and soul.

Psychopomp noun [ Greek ...; psychh` the soul + ... to send: confer French psychopompe .] (Myth.) A leader or guide of souls . J. Fiske.

Psychosis noun [ New Latin See Psycho- .]

1. Any vital action or activity. Mivart.

2. (Medicine) A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.

Psychotherapeutics noun [ Psycho- + therapeutics .] (Medicine) The treatment of disease by acting on the mind, as by suggestion; mind cure; psychotherapy.

Psychotherapy noun [ Psycho- + therapy .] (Medicine) Psychotherapeutics.

Psychozoic adjective [ Psycho- + Greek ... life.] (Geol.) Designating, or applied to the Era of man; as, the psychozoic era.

Psychrometer noun [ Greek psychro`s cold + -meter : confer French psychromètre .] An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.

Psychrometrical adjective Of or pertaining to the psychrometer or psychrometry.

Psychrometry noun Hygrometry.

Psylla noun ; plural Psyllæ . [ New Latin , from Greek ... a flea.] (Zoology) Any leaping plant louse of the genus Psylla , or family Psyllidæ .

Ptarmigan noun [ Gael. tarmachan ; confer Ir. tarmochan , tarmonach .] (Zoology) 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.

» They chiefly inhabit the northern countries and high mountains of Europe, Asia, and America. The common European species is Lagopus mutus . The Scotch grouse, red grouse, or moor fowl ( Latin Scoticus ), is reddish brown, and does not turn white in winter. The white, or willow, ptarmigan ( Latin albus ) is found in both Europe and America.

Ptenoglossa noun plural [ New Latin , from Greek ... feathered + ... tongue.] (Zoology) A division of gastropod mollusks having the teeth of the radula arranged in long transverse rows, somewhat like the barbs of a feather.

Ptenoglossate adjective (Zoology) Of or pertaining to the Ptenoglossa.

Pteranodon noun [ Greek ... wing + ... priv. + ..., ..., a tooth.] (Paleon.) 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 noun plural [ New Latin ] (Paleon.) A group of pterodactyls destitute of teeth, as in the genus Pteranodon .

Pterichthys noun [ New Latin , from Greek ... wing + ... fish.] (Paleon.) 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 noun One who is versed in pteridology.

Pteridology noun [ Greek ..., ..., a fern + -logy .] That department of botany which treats of ferns.

Pteridomania noun [ Greek ..., ..., a fern + English mania .] A madness, craze, or strong fancy, for ferns. [ R.] C. Kingsley.

Pteridophyta noun plural [ New Latin , from Greek ..., ..., a fern + ... a plant.] (Botany) A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia . -- Pter"i*do*phyte` noun

» This is a modern term, devised to replace the older ones acrogens and vascular Cryptogamia .

Pterobranchia noun plural [ New Latin , from Greek ... a wing + ... ....] (Zoology) 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 noun [ New Latin , from Greek ... a wing + ... a horn.] (Zoology) A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell .

Pterocletes noun plural [ New Latin , fr Pterocles , the typical genus, from Greek ... feather + ..., ..., a key, tongue of a clasp.] (Zoology) A division of birds including the sand grouse. They are in some respects intermediate between the pigeons and true grouse. Called also Pteroclomorphæ .

Pterodactyl noun [ Greek ... a wing + ... finger, toe: confer French ptérodactyle .] (Paleon.) An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.

Pterodactyli noun plural [ New Latin ] (Paleon.) Same as Pterosauria .

Pteroglossal adjective [ Greek ... a feather + ... tongue.] (Zoology) Having the tongue finely notched along the sides, so as to have a featherlike appearance, as the toucans.

Pteron noun [ New Latin , from Greek ... a wing.] (Anat.) 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 noun plural [ New Latin , from Greek ... a feather, a bird + ... a grandfather.] (Zool.) Same as Odontotormæ .

Pterophore noun [ Greek ... a feather + ... to bear.] (Zoology) Any moth of the genus Pterophorus and allied genera; a plume moth. See Plume moth , under Plume .