| CLINOPYROXENE | • clinopyroxene n. (Mineralogy) Any pyroxene that has a monoclinic crystal structure. • CLINOPYROXENE n. a member of the pyroxene group of minerals having a monoclinic crystal structure, such as augite, diopside, or jadeite. |
| ORTHOPYROXENE | • orthopyroxene n. (Mineralogy) Any pyroxene that forms orthorhombic crystals. • ORTHOPYROXENE n. a member of the pyroxene group of minerals having an orthorhombic crystal structure, such as enstatite and hypersthene. |
| PAPYROLOGICAL | • papyrological adj. Of or relating to papyrology. • PAPYROLOGICAL adj. related to papyrology. |
| PAPYROLOGISTS | • papyrologists n. Plural of papyrologist. • PAPYROLOGIST n. a student of papyrology. |
| PYROBALLOGIES | • PYROBALLOGY n. the study of artillery. |
| PYROCATECHINS | • pyrocatechins n. Plural of pyrocatechin. • PYROCATECHIN n. another name for catechol, also PYROCATECHOL. |
| PYROCATECHOLS | • pyrocatechols n. Plural of pyrocatechol. • PYROCATECHOL n. another name for catechol, also PYROCATECHIN. |
| PYROELECTRICS | • pyroelectrics n. Plural of pyroelectric. • PYROELECTRIC n. a pyroelectric substance. |
| PYROLYTICALLY | • pyrolytically adv. By means of pyrolysis. • PYROLYTIC adv. relating to pyrolysis, decomposition due to heat. |
| PYROMORPHITES | • pyromorphites n. Plural of pyromorphite. • PYROMORPHITE n. a green, brown, or yellow lead ore. |
| PYROPHOSPHATE | • pyrophosphate n. (Inorganic chemistry) Any salt or ester of pyrophosphoric acid. • PYROPHOSPHATE n. a salt or ester of pyrophosphoric acid. |
| PYROPHYLLITES | • pyrophyllites n. Plural of pyrophyllite. • PYROPHYLLITE n. a silvery-white to pale-green aluminum silicate. |
| PYROSULPHATES | • pyrosulphates n. Plural of pyrosulphate. • PYROSULPHATE n. a salt of sulphur. |
| PYROSULPHURIC | • pyrosulphuric adj. (Britain) Alternative spelling of pyrosulfuric. • PYROSULPHURIC adj. as in pyrosulphuric acid, a type of acid. |
| PYROTARTRATES | • pyrotartrates n. Plural of pyrotartrate. • PYROTARTRATE n. a salt of tartaric acid. |
| PYROTECHNICAL | • pyrotechnical adj. Of or pertaining to pyrotechnics. • pyrotechnical adj. Resembling fireworks. • PYROTECHNICAL adj. relating to pyrotechnics, the art of making fireworks, also PYROTECHNIC. |
| PYROTECHNISTS | • pyrotechnists n. Plural of pyrotechnist. • PYROTECHNIST n. a firework maker. |