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Pyrotritartaric

Designating an acid which is more commonly called uric acid.

Pyrouric

Pertaining to, or designating, an acid now called cyanuric acid. See Cyanuric.

Pyrovanadic

Pertaining to, or designating, an acid of vanadium, analogous to pyrophosphoric acid.

Pyroxanthin

A yellow crystalline hydrocardon extracted from crude wood spirit; -- called also eblanin.

Pyroxene

A common mineral occurring in monoclinic crystals, with a prismatic angle of nearly 90/, and also in massive forms which are often laminated. It varies in color from white to dark green and black, and includes many varieties differing in color and composition, as diopside, malacolite, salite, coccolite, augite, etc. They are all silicates of lime and magnesia with sometimes alumina and iron. Pyroxene is an essential constituent of many rocks, especially basic igneous rocks, as basalt, gabbro, etc.

Pyroxenic

Containing pyroxene; composed chiefly of pyroxene.

Pyroxenite

A rock consisting essentially of pyroxene.

Pyroxylic

Derived from wood by distillation; -- formerly used in designating crude wood spirit.

pyroxylin

A substance resembling gun cotton in composition and properties, but distinct in that it is more highly nitrified and is soluble in alcohol, ether, etc.; -- called also pyroxyle.

Pyrrhic

An ancient Greek martial dance, to the accompaniment of the flute, its time being very quick.

Pyrrhotite Pyrrhotine

A bronze-colored mineral, of metallic luster. It is a sulphide of iron, and is remarkable for being attracted by the magnet. Called also magnetic pyrites.

pyrrole pyrrol

A nitrogenous heterocyclic base found in coal tar, bone oil, and other distillates of organic substances, and also produced synthetically as a colorless liquid, C4H5N, having on odor like that of chloroform. It is the nucleus and origin of a large number of derivatives. So called because it colors a splinter of wood moistened with hydrochloric acid a deep red.

Pyrroline

A nitrogenous base, C4H7N, obtained as a colorless liquid by the reduction of pyrrole.

Pyrula

A genus of large marine gastropods having a pear-shaped shell. It includes the fig-shells. See Illust. in Appendix.

Pyrus

A genus of rosaceous trees and shrubs having pomes for fruit. It includes the apple, crab apple, pear, chokeberry, sorb, and mountain ash.

Pyruvic

Pertaining to, or designating, an acid (called also pyroracemic acid) obtained, as a liquid having a pungent odor, by the distillation of racemic acid.

Pyruvil

A complex nitrogenous compound obtained by heating together pyruvic acid and urea.

Pythagorean

A follower of Pythagoras; one of the school of philosophers founded by Pythagoras.

Pythagorize

To speculate after the manner of Pythagoras.

Pythiad

The period intervening between one celebration of the Pythian games and the next.

Pythian

Of or pertaining to Delphi, to the temple of Apollo, or to the priestess of Apollo, who delivered oracles at Delphi.

Pythocenic

Producing decomposition, as diseases which are supposed to be accompanied or caused by decomposition.

Python

Any species of very large snakes of the genus Python, and allied genera, of the family Pythonid/. They are nearly allied to the boas. Called also rock snake.

Pythoness

The priestess who gave oracular answers at Delphi in Greece.

Pythonic

Prophetic; oracular; pretending to foretell events.

Pythonism

The art of predicting events after the manner of the priestess of Apollo at Delphi; equivocal prophesying.

Pyuria

A morbid condition in which pus is discharged in the urine.

Pyx

To test as to weight and fineness, as the coins deposited in the pyx.

Pyxidium

A pod which divides circularly into an upper and lower half, of which the former acts as a kind of lid, as in the pimpernel and purslane. The theca of mosses.

Q.C.

Quality control.

QCD

Quantum chromodynamics.

QED Q.E.D

Which was demonstrated; -- a phrase used after the conclusion of some line of reasoning, especially in mathematical or logical proofs.

QED.

Quantum electrodynamics.

Qua

In so far as; in the capacity or character of; as.

Qua-bird

The American night heron. See under Night.

Quack

Pertaining to or characterized by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.

Quackery

The acts, arts, or boastful pretensions of a quack; false pretensions to any art; empiricism.

Quackish

Like a quack; boasting; characterized by quackery.

Quacksalver

One who boasts of his skill in medicines and salves, or of the efficacy of his prescriptions; a charlatan; a quack; a mountebank.

Quad

A quadrangle; hence, a prison.

Quadra

The plinth, or lowest member, of any pedestal, podium, water table, or the like. A fillet, or listel.

Quadrable

That may be sqyared, or reduced to an equivalent square; -- said of a surface when the area limited by a curve can be exactly found, and expressed in a finite number of algebraic terms.

Quadragene

An indulgence of forty days, corresponding to the forty days of ancient canonical penance.

Quadragesimals

Offerings formerly made to the mother church of a diocese on Mid-Lent Sunday.

Quadrangular

Having four angles, and consequently four sides; tetragonal.

Quadrans

A fourth part of the coin called an as. See 3d As, 2.

Quadrantal

A cubical vessel containing a Roman cubic foot, each side being a Roman square foot; -- used as a measure.

Quadrat

A block of type metal lower than the letters, -- used in spacing and in blank lines.

Quadrate

To adjust (a gun) on its carriage; also, to train (a gun) for horizontal firing.

Quadratics

That branch of algebra which treats of quadratic equations.

Quadratojugal

Of or pertaining to the quadrate and jugal bones. Of or pertaining to the quadratojugal bone. The quadratojugal bone.

Quadratrix

A curve made use of in the quadrature of other curves; as the quadratrix, of Dinostratus, or of Tschirnhausen.

Quadrature

The act of squaring; the finding of a square having the same area as some given curvilinear figure; as, the quadrature of a circle; the operation of finding an expression for the area of a figure bounded wholly or in part by a curved line, as by a curve, two ordinates, and the axis of abscissas.

Quadrel

A square piece of turf or peat.

Quadrennial

Comprising four years; as, a quadrennial period.

Quadric

A quantic of the second degree. See Quantic. A surface whose equation in three variables is of the second degree. Spheres, spheroids, ellipsoids, paraboloids, hyperboloids, also cones and cylinders with circular bases, are quadrics.

Quadriceps

The great extensor muscle of the knee, divided above into four parts which unite in a single tendon at the knee.

Quadricornous

Having four horns, or hornlike organs; as, a quadricornous beetle.

Quadrifarious

Arranged in four rows or ranks; as, quadrifarious leaves.

Quadrifid

Divided, or deeply cleft, into four parts; as, a quadrifid perianth; a quadrifid leaf.

Quadriga

A car or chariot drawn by four horses abreast.

Quadrijugous

Pinnate, with four pairs of leaflets; as, a quadrijugous leaf.

Quadrilateral

A plane figure having four sides, and consequently four angles; a quadrangular figure; any figure formed by four lines.

Quadrille

A game played by four persons with forty cards, being the remainder of an ordinary pack after the tens, nines, and eights are discarded.

Quadrillion

According to the French notation, which is followed also upon the Continent and in the United States, a unit with fifteen ciphers annexed; according to the English notation, the number produced by involving a million to the fourth power, or the number represented by a unit with twenty-four ciphers annexed. See the Note under Numeration.

Quadrilocular

Having four cells, or cavities; as, a quadrilocular heart.

Quadrin

A small piece of money, in value about a farthing, or a half cent.

Quadrinodal

Possessing four nodes; as, quadrinodal curves.

Quadrinomial

A polynomial of four terms connected by the signs plus or minus.

Quadripartition

A division or distribution by four, or into four parts; also, a taking the fourth part of any quantity or number.

Quadrireme

A galley with four banks of oars or rowers.

Quadrisulcate

Having four hoofs; as, a quadrisulcate foot; a quadrisulcate animal.

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