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Pseudohalter

One of the rudimentary front wings of certain insects (Stylops). They resemble the halteres, or rudimentary hind wings, of Diptera.

Pseudomorphism

The state of having, or the property of taking, a crystalline form unlike that which belongs to the species.

Pseudonavicula

One of the minute spindle-shaped embryos of Gregarin/ and some other Protozoa.

Pseudoneuroptera

division of insects (Zool.) reticulated wings, as in the Neuroptera, but having an active pupa state. It includes the dragon flies, May flies, white ants, etc. By some Zoologists they are classed with the Orthoptera; by others, with the Neuroptera.

Pseudonym

A fictitious name assumed for the time, as by an author; a pen name; an alias.

Pseudonymous

Bearing a false or fictitious name; as, a pseudonymous work.

Pseudopod

Any protoplasmic filament or irregular process projecting from any unicellular organism, or from any animal or plant call.

Pseudopodial

Of or pertaining to a pseudopod, or to pseudopodia. See Illust. of Heliozoa.

Pseudopupa

A stage intermediate between the larva and pupa of bees and certain other hymenopterous insects.

Pseudorhabdite

One of the peculiar rodlike corpuscles found in the integument of certain Turbellaria. They are filled with a soft granular substance.

Pseudoscope

An instrument which exhibits objects with their proper relief reversed; -- an effect opposite to that produced by the stereoscope.

Pseudoscopic

Of, pertaining to, or formed by, a pseudoscope; having its parts appearing with the relief reversed; as, a pseudoscopic image.

Pseudoscorpiones

An order of Arachnoidea having the palpi terminated by large claws, as in the scorpions, but destitute of a caudal sting; the false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. See Illust. of Book scorpion, under Book.

Pseudosphere

The surface of constant negative curvature generated by the revolution of a tractrix. This surface corresponds in non-Euclidian space to the sphere in ordinary space. An important property of the surface is that any figure drawn upon it can be displaced in any way without tearing it or altering in size any of its elements.

Pseudospore

A peculiar reproductive cell found in some fungi.

Pseudostoma

A group of cells resembling a stoma, but without any true aperture among them.

Pseudotetramera

A division of beetles having the fifth tarsal joint minute and obscure, so that there appear to be but four joints.

Pseudovary

The organ in which pseudova are produced; -- called also pseudovarium.

Pseudovum

An egglike germ produced by the agamic females of some insects and other animals, and by the larv/ of certain insects. It is capable of development without fertilization. See Illust. of P/dogenesis.

Pshaw

To express disgust or contemptuous disapprobation, as by the exclamation / Pshaw!/

Psilanthropic

Pertaining to, or embodying, psilanthropy. /A psilanthropic explanation./

Psilanthropy

The doctrine of the merely human existence of Christ.

Psilology

Love of empty of empty talk or noise.

Psilomelane

A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

Psilopaedes

birds whose young at first have down on the pteryl/ only; -- called also Gymnop/des.

Psilopaedic

Having down upon the pteryl/ only; -- said of the young of certain birds.

Psilosopher

A superficial or narrow pretender to philosophy; a sham philosopher.

Psittaci

The order of birds which comprises the parrots.

Psoas

An internal muscle arising from the lumbar vertebr/ and inserted into the femur. In man there are usually two on each side, and the larger one, or great psoas, forms a part of the iliopsoas.

Psora

A cutaneous disease; especially, the itch.

Psoriasis

The state of being affected with psora. A cutaneous disease, characterized by imbricated silvery scales, affecting only the superficial layers of the skin.

Psoric

Of or pertaining to psora.

Psorosperm

A minute parasite, usually the young of Gregarin/, in the pseudonavicula stage.

Psychal

Of or pertaining to the soul; psychical.

Psychanalysis

same as psychoanalysis; -- an older term now obsolete.

Psyche

A lovely maiden, daughter of a king and mistress of Eros, or Cupid. She is regarded as the personification of the soul.

Psychian

Any small moth of the genus Psyche and allied genera (family Psychid/). The larv/ are called basket worms. See Basket worm, under Basket.

Psychical Psychic

Of or pertaining to the human soul, or to the living principle in man.

Psychism

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.

Psycho-motor

Of or pertaining to movement produced by action of the mind or will.

psychoanalyse

To investigate or subject to treatment by psychoanalysis.

Psychoanalysis

A method or process of psychotherapeutic analysis and treatment pf psychoneuroses, based on the work of Dr. Sigmund Freud (1856- 1939) of Vienna. The method rests upon the theory that neurosis is characteristically due to repression of desires consciously rejected but subconsciously persistent; it consists in a close analysis of the patient's mental history, effort being made to bring unconsciuos and preconscious material to consciousness; the methods include analysis of transferance and resistance. In some variants, stress is laid upon the dream life, and of treatment by means of suggestion.

psychoanalyze

To investigate or subject to treatment by psychoanalysis.

Psychogenesis

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

Psychology

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.

Psychometry

The art of measuring the duration of mental processes, or of determining the time relations of mental phenomena.

Psychopannychism

The doctrine that the soul falls asleep at death, and does not wake until the resurrection of the body.

Psychophysical

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

Psychophysics

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.

Psychotherapeutics

The treatment of disease by acting on the mind, as by suggestion; mind cure; psychotherapy.

Psychozoic

Designating, or applied to the Era of man; as, the psychozoic era.

Psychrometer

An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.

Psylla

Any leaping plant louse of the genus Psylla, or family Psyllid/.

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.

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.

Pteridology

That department of botany which treats of ferns.

Pteridophyta

A class of flowerless plants, embracing ferns, horsetails, club mosses, quillworts, and other like plants. See the Note under Cryptogamia.

Pterobranchia

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

A genus of large marine gastropods having the outer border of the lip divided into lobes; -- called also scorpion shell.

Pterocletes

A division of birds including the sand grouse. They are in some respects intermediate between the pigeons and true grouse. Called also Pteroclomorph/.

Pterodactyl

An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.

Pteroglossal

Having the tongue finely notched along the sides, so as to have a featherlike appearance, as the toucans.

Pteron

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.

Pterophore

Any moth of the genus Pterophorus and allied genera; a plume moth. See Plume moth, under Plume.

Pteropoda

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.

Pterosauria

An extinct order of flying reptiles of the Mesozoic age; the pterodactyls; -- called also Pterodactyli, and Ornithosauria.

Pterostigma

A thickened opaque spot on the wings of certain insects.

Pterotic

Of or pertaining to, or designating, a bone between the prootic and epiotic in the dorsal and outer part of the periotic capsule of many fishes. The pterotic bone.

Pterygium

A superficial growth of vascular tissue radiating in a fanlike manner from the cornea over the surface of the eye.

Pterygoid

Like a bird's wing in form; as, a pterygoid bone. Of, pertaining to, or in the region of, the pterygoid bones, pterygoid processes, or the whole sphenoid bone. A pterygoid bone.

Pterygomaxillary

Of or pertaining to the inner pterygoid plate, or pterygoid bone, and the lower jaw.

Pterygopalatine

Of or pertaining to the pterygoid processes and the palatine bones.

Pterygopodium

A specially modified part of the ventral fin in male elasmobranchs, which serves as a copulatory organ, or clasper.

Pterygoquadrate

Of, pertaining to, or representing the pterygoid and quadrate bones or cartilages.

Pteryla

One of the definite areas of the skin of a bird on which feathers grow; -- contrasted with apteria.

Pterylography

The study or description of the arrangement of feathers, or of the pteryl/, of birds.

Pterylosis

The arrangement of feathers in definite areas.

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