A solid resembling a pyramid; -- called also pyramoid.

A pyramid.

See Pyramidoid.

Ruby silver; dark red silver ore. It is a sulphide of antimony and silver, occurring in rhombohedral crystals or massive, and is of a dark red or black color with a metallic adamantine luster.

A funeral pile; a combustible heap on which the dead are burned; hence, any pile to be burnt.

A nutlet resembling a seed, or the kernel of a drupe.

Same as Pyrena.

Of or pertaining to the Pyrenees, a range of mountains separating France and Spain. The Pyrenees.

A transparent body found in the chromatophores of certain Infusoria.

A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.

An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum).

Of or pertaining to fever; febrile.

A discourse or treatise on fevers; the doctrine of fevers.

The febrile condition.

Of or pertaining to fever; feverish.

A variety of pyroxene; -- called also fassaite.

An instrument for measuring the direct heating effect of the sun's rays.

Related to, or formed from, pyridin or its homologues; as, the pyridic bases.

A nitrogenous base, C5H5N, obtained from the distillation of bone oil or coal tar, and by the decomposition of certain alkaloids, as a colorless liquid with a peculiar pungent odor. It is the nucleus of a large number of organic substances, among which several vegetable alkaloids, as nicotine and certain of the ptoma/nes, may be mentioned. See Lutidine.

A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl.

Having the form of a pear; pear-shaped.

Of or pertaining to pyrites. See Pyritic.

A common mineral of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide.

A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color.

Of or pertaining to pyrites; consisting of, or resembling, pyrites.

Containing or producing pyrites.

To convert into pyrites.

Like pyrites in hemihedral form.

The pentagonal dodecahedron, a common form of pyrite.

Pyritohedron.

The science of blowpipe analysis.

Pyritic.

Abbreviation of pyrogallic acid.

Pertaining to, and designating, a substance (acetone) obtained by the distillation of the acetates. It is now called also pyroacetic ether, and formerly was called pyroacetic spirit.

An acid obtained by sybjecting another acid to the action of heat. Cf. Pyro-.

A salt of pyroantimonic acid.

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

A salt of pyroarsenic acid.

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

A salt of pyroboric acid.

Pertaining to derived from, or designating, an acid, H2B4O7 (called also tetraboric acid), which is the acid ingredient of ordinary borax, and is obtained by heating boric acid.

A white crystalline substance, C6H4(OH)2, of the phenol series, found in various plants; -- so called because first obtained by distillation of gum catechu. Called also catechol, oxyphenol. etc.

A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.

Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic, itaconic, and mesaconic acid.

A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.

A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities.

Electricity developed by means of heat; the science which treats of electricity thus developed.

A salt of pyrogallic acid; an ether of pyrogallol.

Pertaining to, derived from, or designating, an acid called pyrogallol. See Pyrogallol.

A phenol metameric with phloroglucin, obtained by the distillation of gallic acid as a poisonous white crystalline substance having acid properties, and hence called also pyrogallic acid. It is a strong reducer, and is used as a developer in photography and in the production of certain dyes.

Electricity.

Producing heat; -- said of substances, as septic poisons, which elevate the temperature of the body and cause fever.

Produced by fire; igneous.

Of or pertaining to characters developed by the use of heat; pertaining to the characters of minerals when examined before the blowpipe; as, the pyrognostic characters of galena.

The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.

A production of pyrography.

A process of printing, ornamenting, or carving, by burning with heated instruments. One variant is wood burning.

Pyrography; also, a design or picture made by pyrography.

A fire worshiper.

The worship of fire.

A crude acetate produced by treating pyroligneous acid with a metal or basic compound; as, pyrolignite of iron (iron liquor).

Same as Pyroligneous.

Same as Pyrouric, or Cyanuric.

One who is versed in, or makes a study of, pyrology.

That branch of physical science which treats of the properties, phenomena, or effects of heat; also, a treatise on heat.

Manganese dioxide, a mineral of an iron-black or dark steel-gray color and metallic luster, usually soft. Pyrolusite parts with its oxygen at a red heat, and is extensively used in discharging the brown and green tints of glass (whence its name).

Acting by the agency of heat and magnetism; as, a pyromagnetic machine for producing electric currents.

A salt of pyromalic acid.

Pertaining to, or designating, an acid now called maleic acid.

Divination by means of fire.

An insane disposition to incendiarism.

One who pretends to divine by fire.

An instrument used for measuring the expansion of solid bodies by heat.

Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.

The art of measuring degrees of heat, or the expansion of bodies by heat.

Native lead phosphate with lead chloride, occurring in bright green and brown hexagonal crystals and also massive; -- so called because a fused globule crystallizes in cooling.

Having the property of crystallizing by the agency of fire.

A salt of pyromucic acid.

Pertaining to, derived from, or designating, an acid obtained as a white crystalline substance by the distillation of mucic acid, or by the oxidation of furfurol.

An unsaturated cyclic compound, C5H4O2, of which two varieties are known, / and /. /-pyrone is the parent substance of several natural yellow dyestuffs.

The science of heat.

A variety of garnet, of a poppy or blood-red color, frequently with a tinge of orange. It is used as a gem. See the Note under Garnet.

A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.

Rendered transparent by heat.

A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.

Light-producing; of or pertaining to pyrophorus.

Any one of several substances or mixtures which phosphoresce or ignite spontaneously on exposure to air, as a heated mixture of alum, potash, and charcoal, or a mixture of charcoal and finely divided lead.

A salt of pyrophosphoric acid.

Pertaining to, or designating, an acid, H4P2O7, which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.

A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.

An instrument for measuring the intensity of heat radiating from a fire, or the cooling influence of bodies. It is a differential thermometer, having one bulb coated with gold or silver leaf.

See Water brash, under Brash.

A mineral, usually of a pale brown or of a gray or grayish green color, consisting chiefly of the hydrous silicate of iron and manganese; -- so called from the odor given off before the blowpipe.

Any compound ascidian of the genus Pyrosoma. The pyrosomes form large hollow cylinders, sometimes two or three feet long, which swim at the surface of the sea and are very phosphorescent.

A salt of pyrosulphuric acid.

Pertaining to, or designating, an acid called also disulphuric acid) obtained by distillation of certain sulphates, as a colorless, thick, oily liquid, H2S2O7 resembling sulphuric acid. It is used in the solution of indigo, in the manufacture of alizarin, and in dehydration.

Pertaining to, or designating, an acid obtained as a white crystalline substance by the distillation of tartaric acid.

A salt of pyrotartaric acid.

A pyrotechnist.

Of or pertaining to fireworks, or the art of forming them.

A pyrotechnist.

The art of making fireworks; the manufacture and use of fireworks; pyrotechny.

One skilled in pyrotechny; one who manufactures fireworks.

The use and application of fire in science and the arts.

A kind of empyreumatic oil produced by the combustion of textures of hemp, linen, or cotton in a copper vessel, -- formerly used as a remedial agent.

Caustic. See Caustic. A caustic medicine.

Designating an acid which is more commonly called uric acid.

Polytungstic. See Metatungstic.

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

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

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

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.

Containing pyroxene; composed chiefly of pyroxene.

A rock consisting essentially of pyroxene.

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

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.

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

One two danced the pyrrhic.

Of or pertaining to pyrrhonism.

Skepticism; universal doubt.