macropterous [macro-, large + pter, wing + -ous] Pertaining to birds, insects, or fish with unusually large wings or fins. (muh KROP ter us)

neuropterous [neuro, nerve +pter, wing+ -ous] Pertaining to carnivorous insects with four membranous wings and biting mouth parts. (noo ROP ter us)

ornithopter [ornitho, bird + pter, wing] An early experimental aircraft designed to be lifted and propelled by flapping wings. (OR nuh thop'ter)

orthopteran [ortho, straight + pter, wing + -an] Any of an order of insects, including locusts, crickets, and grasshoppers, that have, when present, a pair of straight and thickened forewings and a pair of membranous hindwings. (or THOP ter un)

peripteral [peri-, around + pter, wing + -al] Pertaining to a structure with a row of columns on every side. See apteral. (puh RIP ter ul)

pteropod [ptero, wing + podfeet] Any of various small gastropod mollusks, commonly called sea butterflies, with a winglike structure in the foot used for swimming. (TEHR uh pod')

pterosaur [ptero, wing + saur, lizard] Extinct flying reptiles commonly referred to as pterodactyls. See pterodactyl. (TEHR uh sor')

pterygoid [pteryg, wing + -oid, resembling] Wing-shaped. (TEHR uh goid')

tetrapterous [tetra-, four + pter, wing+ -ous] Having four wings or winglike appendages, as many insects. (teh TRAP ter us)

trichopteran [tricho, hair +pter, wing+ -an] Any of an order of insects, commonly called caddis flies, the adults of which have two pairs of hairy membranous wings. (trih KOP ter un)

Purg       clean

compurgation [com-, together + purg, clean + -ation] The former practice of acquitting a person of a charge through the oaths of several others testifying to the innocence of the accused. (korn' pur GAY shun)

expurgate [ex-, out + purg, clean + -ate] To remove objectionable, obscene, or erroneous passages from a book or other publication. (EKS pur gayt')

purgative [purg, clean + -ative] A strong laxative. See physic (def. 1). (PUR guh tiv)

purgatory [purg, clean + -atory] According to Roman Catholics and others, a place in which the souls of those who have died in the grace of God must make atonement for their sins. (PUR guh tor'ee)

purge [purg, clean] To remove anything undesirable, as unused elements, impurities, sin, etc. (purj)

pyr/o   fire, heat, fever

antipyretic [anti-, against +pyrfever+ -etic] 1.Reducing fever. 2.A medicine or other agent that reduces fever. (an' tee peye RET ik)

chalcopyrite [chalco, copper& pyrite] A very common mineral, copper-iron sulfide, that is an important ore of copper. See chalcocite. (kall kuh PEYE reyet')

empyrean [em-, intensive +pyrfire + -ean] 1.Thehighest heaven, believed by ancient cosmologists to be a sphere of pure fire or light. 2.The sky. (em'peye REE un)

hyperpyrexia [hyper-, above + pyrfever + -ia] An abnormally high fever. See pyrexia. (heye' per peye REK see uh)

micropyrometer [micro-, small +pyro, temperature+ meter, to measure] An optical instrument for measuring the temperature of minute glowing bodies. (meye'kroh peye ROM et er)

pyracantha [pyrfire + acanth, thorn + -a] A small shrub commonly referred to as the fire thorn. (peye'ruh KAN thuh)

pyralid [Grk > pyralis, insect believed to live infire] Any of various moths of the family Pyralidae, once believed to live in fire. (PIHR uh lid)

pyrargyrite [pyrftre + argyr, silver + -ite, mineral] A darkred to black mineral that is an important ore of silver. (peye RAHR juh reyet')

pyre [pyrfire]A pile of wood or other combustibles used to burn a dead body as a funeral rite. (peyer)

pyretic [pyrfever + -etic] Pertaining to or producing fever. (peye RET ik)

Pyrex [pyrfire + ex-, out] A trade name for a type of heat-resistant glassware. (PEYE reks)

pyrexia [pyrfever + -ia] Fever. See hyperpyrexia. (peye REK see uh)

pyrheliometer [pyr, heat + helio, sun + meter, to measure] An instrument for measuring the intensity of solar energy. (pihr hee' lee OM et er)

pyrite [pyr,fire + -ire, mineral] A common, pale-yellow mineral with a metallic luster that is often mistaken for gold and therefore nicknamed "fool's gold." It is the main source of sulfur in the manufacture of sulfuric acid. So named because it emits sparks when struck. (PEYE reyet)

pyrochemical [pyro, heat & chemical] Producing or affected by chemical action at high temperatures. (peye'roh KEM ih kul)

pyroclastic [pyro,fire + Grk > klastes, breaker + -ic] Formed by rock fragmentation through volcanic action. (peye'roh KLAS tik)

pyroelectricity [pyro, heat& electricity] An electrical charge generated in certain crystals by temperature changes. (peye'roh ih lek'TRIS ih tee)

pyrogen [pyro,fever + gen, cause] Any substance that causes fever. (PEYE ruh jen)

pyrogenic [pyro, heat+ gen, to produce+ -ic] Inducing or resulting from heat or fever 2. Produced by heat, as igneous rock. (peye'roh JEN ik)

pyrognostics [pyrofire + gnos, knowledge + -tic] The properties exhibited by a mineral when heated (peyel rog NOS tiks)