Part 698

Pyr`e*ne"an (?), a. [L. Pyrenaei (sc. montes) the Pyrenees, fr. Pyrene, Gr.&?; 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. -- n. The Pyrenees. Shak.

Py*re"noid (?), n. [Gr. &?; like a kernel. See Pyrena, and -oid.] (Zoˆl.) A transparent body found in the chromatophores of certain Infusoria.

Pyr"eth*rin (?), n. [NL. Pyrethrum, generic name of feverfew, Gr. &?; feverfew.] (Chem.) A substance resembling, and isomeric with, ordinary camphor, and extracted from the essential oil of feverfew; -- called also Pyrethrum camphor.

Pyr"eth*rine (?), n. (Chem.) An alkaloid extracted from the root of the pellitory of Spain (Anacyclus pyrethrum).

Py*ret"ic (?), a. [Gr. &?; burning heat, fever, from &?; fire: cf. F. pyrÈtique.] (Med.) Of or pertaining to fever; febrile.

Pyr`e*tol"o*gy (?), n. [Gr. &?; fever + -logy: cf. F. pyrÈtologie.] (Med.) A discourse or treatise on fevers; the doctrine of fevers. Hooper.

||Py*rex"i*a (?), n.; pl. PyrexiÊ (#). [NL., fr. Gr. &?; to be ||feverish, akin to &?; fever.] (Med.) The febrile condition.

{ Py*rex"i*al (?), Py*rex"ic*al (?), } a. (Med.) Of or pertaining to fever; feverish.

Pyr"gom (?), n. [Gr. &?; a place furnished with towers, fr. &?; a tower.] (Min.) A variety of pyroxene; -- called also fassaite.

Pyr*he`li*om"e*ter (?), n. [Gr. &?; fire + &?; sun + -meter.] (Physics) An instrument for measuring the direct heating effect of the sun's rays.

Py*rid"ic (?), a. (Physiol. Chem.) Related to, or formed from, pyridin or its homologues; as, the pyridic bases.

Pyr"i*dine (?), n. [From Gr. &?; fire.] (Physiol. Chem.) 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 ptomaÔnes, may be mentioned. See Lutidine.

Pyr"i*dyl (?), n. [Pyridine + -yl.] (Chem.) A hypothetical radical, C5H4N, regarded as the essential residue of pyridine, and analogous to phenyl.

Pyr"i*form (?), a. [L. pyrum, pirum, a pear + -form: cf. F. pyriforme, piriforme.] Having the form of a pear; pear- shaped.

Pyr`i*ta"ceous (?), a. (Min.) Of or pertaining to pyrites. See Pyritic.

Pyr"ite (?), n.; pl. Pyrites (#). [Cf. F. 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.

Py*ri"tes (?), n. [L., fr. Gr. &?;, fr. &?; 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.

{ Py*rit"ic (?), Py*rit"ic*al (?), } a. (Min.) Of or pertaining to pyrites; consisting of, or resembling, pyrites.

Pyr`i*tif"er*ous (?), a. [Pyrites + -ferous.] (Min.) Containing or producing pyrites.

Pyr"i*tize (?), v. t. [Cf. F. pyritiser.] To convert into pyrites.

Pyr`i*to*he"dral (?), a. [See Pyritohedron.] (Crystallog.) Like pyrites in hemihedral form.

Pyr`i*to*he"dron (?), n. [Pyrite + Gr. &?; base.] (Crystallog.) The pentagonal dodecahedron, a common form of pyrite.

Pyr"i*toid (?), n. [Pyrite + - oid.] (Crystallog.) Pyritohedron. [R.]

Pyr`i*tol"o*gy (?), n. [Gr. &?; of fire + -logy.] The science of blowpipe analysis.