Pyroelectricity Pyr`o·e`lec·tric"i·ty noun (Physics) Electricity developed by means of heat; the science which treats of electricity thus developed.
Pyrogallate Pyr`o·gal"late noun (Chemistry) A salt of pyrogallic acid; an ether of pyrogallol.
Pyrogallic Pyr`o·gal"lic adjective [
Pyro- +
gallic .]
(Chemistry) Pertaining to, derived from, or designating, an acid called pyrogallol . See Pyrogallol .
Pyrogallol Pyr`o·gal"lol noun [
Pyrogallic +
-ol .]
(Chemistry) 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.
Pyrogen Pyr"o·gen noun [ See
Pyrogenous .]
1. Electricity. [ R.]
2. (Physiol. Chem.) A poison separable from decomposed meat infusions, and supposed to be formed from albuminous matter through the agency of bacteria.
Pyrogenic Pyr`o·gen"ic adjective [
Pyro- +
-gen +
-ic .]
(Physiol.) Producing heat; -- said of substances, as septic poisons, which elevate the temperature of the body and cause fever.
Pyrogenous Py·rog"e·nous adjective [ Greek ... fire +
genous : confer French
purogène , Greek ....]
Produced by fire; igneous. Mantell. .
Pyrognostic Pyr`og·nos"tic adjective [
Pyro- + Greek ... to know.]
(Min.) 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.
Pyrognostics Pyr`og·nos"tics noun plural (Min.) The characters of a mineral observed by the use of the blowpipe, as the degree of fusibility, flame coloration, etc.
Pyrograph Py"ro·graph noun A production of pyrography.
Pyrography Py·rog"ra·phy noun [
Pyro- +
-graphy .]
A process of printing, ornamenting, or carving, by burning with heated instruments.
Pyrogravure Py`ro·gra·vure" noun [
Pyro- + French
gravure engraving.]
Pyrography; also, a design or picture made by pyrography.
Pyrolator Py·rol"a·tor noun [ See
Pyrolatry .]
A fire worshiper. [ R.]
Southey.
Pyrolatry Py·rol"a·try noun [
Pyro- + Greek ... worship: confer French
pyrolâtrie .]
The worship of fire. Young.
Pyroligneous, Pyrolignic Pyr`o·lig"ne·ous, Pyr`o·lig"nic adjective [
Pyro -+ Latin
lignum wood: confer French
pyroligneux .]
(Old Chem.) Pertaining to, or designating, the acid liquid obtained in the distillation of wood, consisting essentially of impure acetic acid.
Pyrolignite Py`ro·lig"nite noun A crude acetate produced by treating pyroligneous acid with a metal or basic compound; as, pyrolignite of iron (iron liquor).
Pyrolignous Pyr`o·lig"nous adjective Same as Pyroligneous .
Pyrolithic Pyr`o·lith"ic adjective [
Pyro- +
lithic .]
(Old Chem.) Same as Pyrouric , or Cyanuric .
Pyrologist Py·rol"o·gist noun One who is versed in, or makes a study of, pyrology.
Pyrology Py·rol"o·gy noun [
Pyro- +
- logy : confer French
pyrologie .]
That branch of physical science which treats of the properties, phenomena, or effects of heat; also, a treatise on heat.
Pyrolusite Pyr`o·lu"site noun [
Pyro- + Greek ... to loose, or ... a loosing.]
(Min.) 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).
Pyromagnetic Pyr`o·mag·net"ic adjective [
Pyro- +
magnetic .]
(Physics) Acting by the agency of heat and magnetism; as, a pyromagnetic machine for producing electric currents.
Pyromalate Pyr`o·ma"late noun (Chemistry) A salt of pyromalic acid. [ Obsolete]
Pyromalic Pyr`o·ma"lic adjective [
Pyro- +
malic .]
(Old Chem.) Pertaining to, or designating, an acid now called maleic acid .
Pyromancy Pyr"o·man`cy noun [ Greek ...; ... fire + ... divination: confer French
pyromancie .]
Divination by means of fire.
Pyromania Pyr"o·ma"ni·a noun [
Pyro- +
mania .]
An insane disposition to incendiarism.
Pyromantic Pyr"o·man"tic adjective Of or pertaining to pyromancy.
Pyromantic Pyr`o·man"tic noun [ Confer Greek ....]
One who pretends to divine by fire. Sir T. Herbert.
Pyrometer Py·rom"e·ter noun [
Pyro- +
-meter : confer French
pyromètre .]
1. (Physics) An instrument used for measuring the expansion of solid bodies by heat. 2. (Physics) An instrument for measuring degrees of heat above those indicated by the mercurial thermometer. » It is usually constructed so as to register the change which the heat to be measured produces in the length of some expansible substance, as a metallic rod, or in the intensity of a thermo-electric current.
Pyrometric, Pyrometrical Pyr`o·met"ric, Pyr`o·met"ric·al adjective [ Confer French
pyrométrique .]
(Physics) Pertaining to, or obtained by, the pyrometer; as, pyrometrical instruments; pyrometrical measurements.
Pyrometry Py·rom"e·try noun The art of measuring degrees of heat, or the expansion of bodies by heat.
Pyromorphite Pyr`o·mor"phite noun [ German
pyromorphit , from Greek ... fire + ... form.]
(Min.) 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.
Pyromorphous Pyr`o·mor"phous adjective [
Pyro- +
-morphous .]
(Min.) Having the property of crystallizing by the agency of fire.
Pyromucate Pyr`o·mu"cate noun (Chemistry) A salt of pyromucic acid.
Pyromucic Pyr`o·mu"cic adjective [
Pyro- +
mucic .]
(Chemistry) 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.
Pyrone Py`rone noun [ German
pyron , an abbr. of
pyrokoman .]
(Org. Chem.) An unsaturated cyclic compound, C 5 H 4 O 2 , of which two varieties are known, α and γ. γ-pyrone is the parent substance of several natural yellow dyestuffs.
Pyronomics Pyr`o·nom"ics noun [
Pyro- + Greek ... law.]
The science of heat.
Pyrope Pyr"ope noun [ Latin
pyropus a kind of red bronze, from Greek ...; ... fire + ... the eye, face: confer French
pyrope .]
(Min.) 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 .
Pyrophane Pyr"o·phane noun [ See
Pyrophanous .]
(Min.) A mineral which is opaque in its natural state, but is said to change its color and become transparent by heat.
Pyrophanous Py·roph"a·nous adjective [
Pyro- + Greek ... to show, pass, to shine.]
Rendered transparent by heat.
Pyrophone Pyr"o·phone noun [
Pyro- + Greek ... sound.]
A musical instrument in which the tones are produced by flames of hydrogen, or illuminating gas, burning in tubes of different sizes and lengths.
Pyrophoric, Pyrophorous Pyr`o·phor"ic, Py·roph"o·rous adjective [
Pyro- + Greek ... to bear.]
Light- producing; of or pertaining to pyrophorus. Pyrophoric iron (Chemistry) ,
finely reduced iron, which ignites spontaneously on contact with air.
Pyrophorus Py·roph"o·rus noun [ New Latin See
Pyrophorous .]
(Old Chem.) 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.
Pyrophosphate Pyr"o·phos"phate noun (Chemistry) A salt of pyrophosphoric acid.
Pyrophosphoric Pyr`o·phos·phor"ic adjective [
Pyro- +
phosphoric .]
(Chemistry) Pertaining to, or designating, an acid, H 4 P 2 O 7 , which is obtained as a white crystalline substance. Its salts are obtained by heating the phosphates.
Pyrophyllite Py·roph"yl·lite noun [
Pyro- + Greek ... leaf.]
(Min.) A mineral, usually of a white or greenish color and pearly luster, consisting chiefly of the hydrous silicate of alumina.
Pyroscope Pyr"o·scope noun [
Pyro- +
- scope : confer French
pyroscope .]
(Physics) 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. [ R.]
Pyrosis Py·ro"sis noun [ New Latin , fr Greek ... a burning, an inflammation, from ... to burn, from ... fire.]
(Medicine) See Water brash , under Brash .
Pyrosmalite Py·ros"ma·lite noun [
Pyro- + Greek ... odor +
-like . ]
(Min.) 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.
Pyrosome Pyr"o·some noun [
Pyro- +
- some body.]
(Zoology) 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.
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