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Pleiophyllous

Having several leaves; -- used especially when several leaves or leaflets appear where normally there should be only one.

Pleistocene

Of or pertaining to the epoch, or the deposits, following the Tertiary, and immediately preceding man. The Pleistocene epoch, or deposits.

Plenal

Full; complete; as, a plenal view or act.

Plenarty

The state of a benefice when occupied.

Plene

Full; complete; plenary.

Plenicorn

A ruminant having solid horns or antlers, as the deer.

Plenipotentiary

Containing or conferring full power; invested with full power; as, plenipotentiary license; plenipotentiary ministers.

Plenist

One who holds that all space is full of matter.

Plenitude

The quality or state of being full or complete; fullness; completeness; abundance; as, the plenitude of space or power.

Plenteous

Containing plenty; abundant; copious; plentiful; sufficient for every purpose; as, a plenteous supply.

Plentiful

Containing plenty; copious; abundant; ample; as, a plentiful harvest; a plentiful supply of water.

Plenum

That state in which every part of space is supposed to be full of matter; -- opposed to vacuum.

Pleochroism

The property possessed by some crystals, of showing different colors when viewed in the direction of different axes.

Pleomorphic

Pertaining to pleomorphism; as, the pleomorphic character of bacteria.

Pleomorphism

The property of crystallizing under two or more distinct fundamental forms, including dimorphism and trimorphism.

Pleonasm

Redundancy of language in speaking or writing; the use of more words than are necessary to express the idea; as, I saw it with my own eyes.

Pleonast

One who is addicted to pleonasm.

Pleopod

One of the abdominal legs of a crustacean. See Illust. under Crustacea.

Plerome

The central column of parenchyma in a growing stem or root.

Plesimorphism

The property possessed by some substances of crystallizing in closely similar forms while unlike in chemical composition.

Plesiosauria

An extinct order of Mesozoic marine reptiles including the genera Plesiosaurus, and allied forms; -- called also Sauropterygia.

Plesiosaurus

A genus of large extinct marine reptiles, having a very long neck, a small head, and paddles for swimming. It lived in the Mesozoic age.

Plethora

Overfullness; especially, excessive fullness of the blood vessels; repletion; that state of the blood vessels or of the system when the blood exceeds a healthy standard in quantity; hyper/mia; -- opposed to an/mia.

Plethoric

Haeving a full habit of body; characterized by plethora or excess of blood; as, a plethoric constitution; -- used also metaphorically.

Plethrum Plethron

A long measure of 100 Greek, or 101 English, feet; also, a square measure of 10,000 Greek feet.

Plethysmograph

An instrument for determining and registering the variations in the size or volume of a limb, as the arm or leg, and hence the variations in the amount of blood in the limb.

Plethysmography

The study, by means of the plethysmograph, of the variations in size of a limb, and hence of its blood supply.

Pleura

The smooth serous membrane which closely covers the lungs and the adjacent surfaces of the thorax; the pleural membrane. The closed sac formed by the pleural membrane about each lung, or the fold of membrane connecting each lung with the body wall.

Pleural

Of or pertaining to the pleura or pleur/, or to the sides of the thorax.

Pleurapophysis

One of the ventral processes of a vertebra, or the dorsal element in each half of a hemal arch, forming, or corresponding to, a vertebral rib.

Pleurenchyma

A tissue consisting of long and slender tubular cells, of which wood is mainly composed.

Pleurisy

An inflammation of the pleura, usually accompanied with fever, pain, difficult respiration, and cough, and with exudation into the pleural cavity.

Pleurobrachia

A genus of ctenophores having an ovate body and two long plumose tentacles.

Pleurobranch

Any one of the gills of a crustacean that is attached to the side of the thorax.

Pleurocarpous Pleurocarpic

Side-fruited; -- said of those true mosses in which the pedicels or the capsules are from lateral archegonia; -- opposed to acrocarpous.

Pleurocentrum

One of the lateral elements in the centra of the vertebr/ in some fossil batrachians.

Pleuroderes

A group of fresh-water turtles in which the neck can not be retracted, but is bent to one side, for protection. The matamata is an example.

Pleurodynia

A painful affection of the side, simulating pleurisy, usually due to rheumatism.

Pleuron

One of the sides of an animal. One of the lateral pieces of a somite of an insect. One of lateral processes of a somite of a crustacean.

Pleuronectoid

Pertaining to the Pleuronectid/, or Flounder family.

Pleuroperitoneal

Of or pertaining to the pleural and peritoneal membranes or cavities, or to the pleuroperitoneum.

Pleuroperitoneum

The pleural and peritoneal membranes, or the membrane lining the body cavity and covering the surface of the inclosed viscera; the peritoneum; -- used especially in the case of those animals in which the body cavity is not divided.

Pleuropneumonia

Inflammation of the pleura and lungs; a combination of pleurisy and pneumonia, esp. a kind of contagions and fatal lung plague of cattle.

Pleuroptera

A group of Isectivora, including the colugo.

Pleurosigma

A genus of diatoms of elongated elliptical shape, but having the sides slightly curved in the form of a letter S. Pleurosigma angulatum has very fine striations, and is a favorite object for testing the high powers of microscopes.

Pleurosteon

The antero-lateral piece which articulates the sternum of birds.

Pleurothotonus

A species of tetanus, in which the body is curved laterally.

Pleurotoma

Any marine gastropod belonging to Pleurotoma, and ether allied genera of the family Pleurotmid/. The species are very numerous, especially in tropical seas. The outer lip has usually a posterior notch or slit.

Pleximeter

A small, hard, elastic plate, as of ivory, bone, or rubber, placed in contact with body to receive the blow, in examination by mediate percussion.

Plexure

The act or process of weaving together, or interweaving; that which is woven together.

Plexus

A network of vessels, nerves, or fibers.

Pleyt

An old term for a river boat.

Pliability

The quality or state of being pliable; flexibility; as, pliability of disposition.

Pliable

Capable of being plied, turned, or bent; easy to be bent; flexible; pliant; supple; limber; yielding; as, willow is a pliable plant.

Pliancy

The quality or state of being pliant in sense; as, the pliancy of a rod.

Pliant

Capable of plying or bending; readily yielding to force or pressure without breaking; flexible; pliable; lithe; limber; plastic; as, a pliant thread; pliant wax. Also used figuratively: Easily influenced for good or evil; tractable; as, a pliant heart.

Plica

A disease of the hair (Plica polonica), in which it becomes twisted and matted together. The disease is of Polish origin, and is hence called also Polish plait.

Plicidentine

A form of dentine which shows sinuous lines of structure in a transverse section of the tooth.

Pliers

A kind of small pinchers with long jaws, -- used for bending or cutting metal rods or wire, for handling small objects such as the parts of a watch, etc.

Pliform

In the form of a ply, fold, or doubling.

Plight

To pledge; to give as a pledge for the performance of some act; as, to plight faith, honor, word; -- never applied to property or goods.

Plighter

One who, or that which, plights.

Plim

To swell, as grain or wood with water.

Plinth

In classical architecture, a vertically faced member immediately below the circular base of a column; also, the lowest member of a pedestal; hence, in general, the lowest member of a base; a sub-base; a block upon which the moldings of an architrave or trim are stopped at the bottom. See Illust. of Column.

Pliocene

The Pliocene period or deposits.

Pliohippus

An extinct genus of horses from the Pliocene deposits. Each foot had a single toe (or hoof), as in the common horse.

Pliosaurus

An extinct genus of marine reptiles allied to Plesiosaurus, but having a much shorter neck.

Plitt

An instrument of punishment or torture resembling the knout, used in Russia.

Ploc

A mixture of hair and tar for covering the bottom of a ship.

Ploce

A figure in which a word is separated or repeated by way of emphasis, so as not only to signify the individual thing denoted by it, but also its peculiar attribute or quality; as, /His wife's a wife indeed./

Plod

To walk on slowly or heavily.

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