Pyramidoid Py·ram"i·doid noun [ Greek ..., ..., pyramid +
-id : confer French
pyramidoïde .]
A solid resembling a pyramid; -- called also pyramoid . Barlow.
Pyramis Pyr"a·mis noun ;
plural Pyramides . [ Latin ]
A pyramid.
Pyramoid Pyr"a·moid noun See Pyramidoid .
Pyrargyrite Py·rar"gy·rite noun [ Greek ... fire + ... silver.]
(Min.) 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.
Pyrazine Pyr"a·zine noun Also
-zin [
Pyr idine + Greek ... not + ... life.]
(Org. Chem.) A feebly basic solid, C 4 H 4 N 2 , obtained by distilling piperazine with zinc dust, and in other ways. Also, by extension, any of various derivatives of the same.
Pyre Pyre noun [ Latin
pure , Greek ..., from ... fire. See
Fire .]
A funeral pile; a combustible heap on which the dead are burned; hence, any pile to be burnt. For nine long nights, through all the dusky air,
The pyres thick flaming shot a dismal glare.
Pope.
Pyrena Py·re"na noun ;
plural Pyrenæ . [ New Latin , from Greek ..., the stone of fruit.]
(Botany) A nutlet resembling a seed, or the kernel of a drupe. Gray.
Pyrene Py"rene noun [ Greek ... fire.]
(Chemistry) One of the less volatile hydrocarbons of coal tar, obtained as a white crystalline substance, C 16 H 10 .
Pyrene Py"rene noun (Botany) Same as Pyrena .
Pyrenean Pyr`e·ne"an adjective [ Latin
Pyrenaei (sc.
monte s) the Pyrenees, from
Pyrene , Greek ... a daughter of Bebryx, beloved by Hercules, and buried upon these mountains.]
Of or pertaining to the Pyrenees, a range of mountains separating France and Spain. --
noun The Pyrenees. Shak.
Pyrenoid Py·re"noid noun [ Greek ... like a kernel. See
Pyrena , and
-oid .]
(Zoology) A transparent body found in the chromatophores of certain Infusoria.
Pyrethrin Pyr"eth·rin noun [ New Latin
Pyrethrum , generic name of feverfew, Greek ... feverfew.]
(Chemistry) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor .
Pyrethrine Pyr"eth·rine noun (Chemistry) An alkaloid extracted from the root of the pellitory of Spain ( Anacyclus pyrethrum ).
Pyretic Py·ret"ic adjective [ Greek ... burning heat, fever, from ... fire: confer French
pyrétique .]
(Medicine) Of or pertaining to fever; febrile.
Pyretology Pyr`e·tol"o·gy noun [ Greek ... fever +
-logy : confer French
pyrétologie .]
(Medicine) A discourse or treatise on fevers; the doctrine of fevers. Hooper.
Pyrexia Py·rex"i·a noun ;
plural Pyrexiæ . [ New Latin , from Greek ... to be feverish, akin to ... fever.]
(Medicine) The febrile condition.
Pyrexial, Pyrexical Py·rex"i·al, Py·rex"ic·al adjective (Medicine) Of or pertaining to fever; feverish.
Pyrgom Pyr"gom noun [ Greek ... a place furnished with towers, from ... a tower.]
(Min.) A variety of pyroxene; -- called also fassaite .
Pyrheliometer Pyr·he`li·om"e·ter noun [ Greek ... fire + ... sun +
-meter .]
(Physics) An instrument for measuring the direct heating effect of the sun's rays.
Pyridic Py·rid"ic adjective (Physiol. Chem.) Related to, or formed from, pyridin or its homologues; as, the pyridic bases.
Pyridine Pyr"i·dine noun [ From Greek ... fire.]
(Physiol. Chem.) A nitrogenous base, C 5 H 5 N, 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 ptomaïnes, may be mentioned. See Lutidine .
Pyridyl Pyr"i·dyl noun [
Pyrid ine +
-yl .]
(Chemistry) A hypothetical radical, C 5 H 4 N, regarded as the essential residue of pyridine, and analogous to phenyl.
Pyriform Pyr"i·form adjective [ Latin
pyrum ,
pirum , a pear +
-form : confer French
pyriforme ,
piriforme .]
Having the form of a pear; pear- shaped.
Pyritaceous Pyr`i·ta"ceous adjective (Min.) Of or pertaining to pyrites. See Pyritic .
Pyrite Pyr"ite noun ;
plural Pyrites . [ Confer French
pyrite . See
Pyrites .]
(Min.) A common mineral of a pale brass- yellow color and brilliant metallic luster, crystallizing in the isometric system; iron pyrites; iron disulphide. Hence sable coal his massy couch extends,
And stars of gold the sparkling pyrite blends.
E. Darwin.
Pyrites Py·ri"tes noun [ Latin , from Greek ..., from ... fire. See
Pyre .]
(Min.) A name given to a number of metallic minerals, sulphides of iron, copper, cobalt, nickel, and tin, of a white or yellowish color. » The term was originally applied to the mineral pyrite, or iron pyrites, in allusion to its giving sparks when struck with steel.
Arsenical pyrites ,
arsenopyrite. --
Auriferous pyrites .
See under Auriferous . --
Capillary pyrites ,
millerite. --
Common pyrites ,
isometric iron disulphide; pyrite. --
Hair pyrites ,
millerite. --
Iron pyrites .
See Pyrite . --
Magnetic pyrites ,
pyrrhotite. --
Tin pyrites ,
stannite. --
White iron pyrites ,
orthorhombic iron disulphide; marcasite. This includes cockscomb pyrites (a variety of marcasite, named in allusion to its form), spear pyrites, etc. --
Yellow , or
Copper ,
pyrites ,
the sulphide of copper and iron; chalcopyrite.
Pyritic, Pyritical Py·rit"ic, Py·rit"ic·al adjective (Min.) Of or pertaining to pyrites; consisting of, or resembling, pyrites.
Pyritiferous Pyr`i·tif"er·ous adjective [
Pyrites +
-ferous .]
(Min.) Containing or producing pyrites.
Pyritize Pyr"i·tize transitive verb [ Confer French
pyritiser .]
To convert into pyrites.
Pyritohedral Pyr`i·to·he"dral adjective [ See
Pyritohedron .]
(Crystallog.) Like pyrites in hemihedral form.
Pyritohedron Pyr`i·to·he"dron noun [
Pyrite + Greek ... base.]
(Crystallog.) The pentagonal dodecahedron, a common form of pyrite.
Pyritoid Pyr"i·toid noun [
Pyrite +
- oid .]
(Crystallog.) Pyritohedron. [ R.]
Pyritology Pyr`i·tol"o·gy noun [ Greek ... of fire +
-logy .]
The science of blowpipe analysis.
Pyritous Pyr"i·tous adjective Pyritic.
Pyro Py"ro noun (Photog.) Abbreviation of pyrogallic acid . [ Colloq.]
Pyro-, Pyr- Pyro-, Pyr- [ Greek ..., ..., fire.] Combining forms designating fire or heat ; specifically (Chemistry) , used to imply an actual or theoretical derivative by the action of heat ; as in pyro phosphoric, pyro sulphuric, pyro tartaric, pyro tungstic, etc.
Pyroacetic Pyr`o·a·ce"tic adjective [
Pyro- +
acetic : confer French
pyroacétique .]
(Chemistry) 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 .
Pyroacid Pyr`o·ac"id noun [
Pyro- +
acid .]
(Chemistry) An acid obtained by sybjecting another acid to the action of heat. Confer Pyro- .
Pyroantimonate Pyr`o·an`ti·mo"nate noun (Chemistry) A salt of pyroantimonic acid.
Pyroantimonic Pyr`o·an`ti·mon"ic adjective [
Pyro- +
antimonic .]
(Chemistry) Pertaining to, or designating, an acid of antimony analogous to pyrophosphoric acid.
Pyroarsenate Pyr`o·ar"se·nate noun (Chemistry) A salt of pyroarsenic acid.
Pyroarsenic Pyr`o·ar·sen"ic adjective [
Pyro- +
arsenic .]
(Chemistry) Pertaining to or designating, an acid of arsenic analogous to pyrophosphoric acid.
Pyroborate Pyr`o·bo"rate noun (Chemistry) A salt of pyroboric acid.
Pyroboric Pyr`o·bo"ric adjective [
Pyro- +
boric .]
(Chemistry) Pertaining to derived from, or designating, an acid, H 2 B 4 O 7 (called also tetraboric acid), which is the acid ingredient of ordinary borax, and is obtained by heating boric acid.
Pyrocatechin Pyr`o·cat"e·chin noun [
Pyro- +
catechu .]
(Chemistry) A white crystalline substance, C 6 H 4 (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.
Pyrochlore Pyr"o·chlore noun [
Pyro- + Greek ... pale green.]
(Min.) 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.
Pyrocitric Pyr`o·cit"ric adjective [
Pyro- +
citric : confer French
pyrocitrique .]
(Chemistry) Pertaining to, or designating, any one of three acids obtained by the distillation of citric acid, and called respectively citraconic , itaconic , and mesaconic acid.
Pyrocoll Pyr"o·coll (pĭr"o*kŏl)
noun [
Puro- + Greek
ko`lla glue.]
(Chemistry) A yellow crystalline substance allied to pyrrol, obtained by the distillation of gelatin.
Pyroelectric Pyr`o·e·lec"tric adjective [
Pyro- +
electric .]
(Physics) Pertaining to, or dependent on, pyroelectricity; receiving electric polarity when heated.
Pyroelectric Pyr`o·e·lec"tric noun (Physics) A substance which becomes electrically polar when heated, exhibiting opposite charges of statical electricity at two separate parts, especially the two extremities.
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