Skip to content A B C D E F G H I J K L M N O P Q R S T U V W X Y Z pyridyl Any of three isomeric univalent radicals, C₅H₄N-, derived from pyridine; analogous to phenyl. pyridylamide An ion derived from pyridylamine, by the removal of a hydrogen ion pyridylaminate To react with a pyridylamino group pyridylamination Reaction with a pyridylamino group pyridylamine Aminopyridine: an amine derived from pyridine pyridylamino Any pyridyl derivative of an amino group pyridylazo Any of three isomeric univalent azo radicals derived from pyridine, C₅H₄N-N==N-, having the azo group in the 2-, 3- or 4- position pyridylbenzene Synonym of phenylpyridine. pyridylglycine An N-pyridyl derivative of glycine pyridylidene A carbene derived from pyridine pyridylmethyl Any pyridyl derivative of a methyl group pyridylsulfoximine Any pyridyl sulfoximine pyridyne The pyridine analogue of benzyne. pyrifenox A particular fungicide. pyriform Pear-shaped. pyriformly In a pyriform manner. Pyrih A surname from Ukrainian. pyrilamine Mepyramine. pyrimethamine A synthetic compound derived from pyrimidine, acting as a folic acid antagonist and used in the chemoprophylaxis or treatment of malaria and in the treatment of toxoplasmosis. pyrimethanil A particular pesticide. pyrimidine A diazine in which the two nitrogen atoms are in the meta- positions; it is the basis of three of the bases found in DNA and RNA: thymine, uracil and cytosine pyrimidinedione Any of a class of chemical compounds characterized by a pyrimidine ring substituted with two carbonyl groups. pyrimidinergic Containing or releasing pyrimidine pyrimidinetrione Any derivative of pyrimidine that has three carbonyl groups in the ring; many are barbiturates pyrimidinic Of or pertaining to a pyrimidine. pyrimidinone Any of several heterocyclic ketones derived from pyrimidine. pyrimidinyl A univalent radical derived from pyrimidine pyrimidinylpiperazine 1-(2-pyrimidinyl)piperazine, a piperazine derivative. pyrimidodiazepine Any heterocycle formed by fusion of a pyrimidone and a diazepine pyrimidoindole Any of a class of heterocycles composed of a pyrimidine fused to an indole pyrimidole Any alcohol that has a pyrimidine substituent pyrimidone Either of two heterocyclic compounds, with chemical formula C₄H₄N₂O, whose derivatives are the basis of many other biological molecules. pyrimidopteridine A tricyclic heterocycle formed by fusion of a pyrimidine and a pteridine pyrimidopyrimidine A bicyclic heterocycle composed of two pyrimidine rings fused together pyrimidotriazinedione A bicyclic heterocyclic ketone pyrimitate A pesticide. pyrin A protein that regulates the body's inflammatory response to trauma. pyrindene Either of two isomeric bicyclic heterocycles consisting of a cyclopentane ring fused to that of pyridine pyrinoline An antiarrhythmic drug. pyrinuron A particular rodenticide. Pyriphlegethon Synonym of Phlegethon. pyriproxyfen A pyridine-based pesticide effective against a variety of arthropods. pyritaceous Of, relating to, or containing pyrites; pyritic. pyrite The common mineral iron disulfide (FeS₂), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system. pyrithiamine A particular antibiotic that is an analogue of thiamine. pyrithione The tautomeric compound 1-hydroxy-2(1H)-pyridinethione (thione form) or 2-pyridinethiol 1-oxide (thiol form) pyrithioxin pyritinol pyrithioxine pyritinol pyrithyldione A psychoactive drug formerly used as a sedative. pyritic of, relating to, or consisting of pyrite or pyrites pyritical pyritic (relating to, resembling, or consisting of pyrites) pyritiferous containing, or yielding pyrites pyritified Synonym of pyritized pyritinol A nootropic drug whose structure is that of a disulfane derived from pyridoxine. pyritization The hydrothermal process whereby a rock is transformed into a pyrite. pyritize To convert something into pyrites. pyritized In a state of pyritization; having been turned to pyrite. pyritohedral Having the shape of pyrites. pyritohedron An irregular dodecahedron, the faces of which are identical but irregular pentagons. pyritoid pyritohedron pyritology the art of using a blowpipe, and often a charcoal block, to analyse minerals and metal salts pyritose pyritous pyritous pyritic pyrity Relating to, or containing pyrites Pyrmont A suburb of Sydney in the Sydney council area, New South Wales, Australia. pyro A pyromaniac. pyroacetic of or relating to acetone (once obtained by heating acetates) pyroacid any acid obtained by heating another pyroaconitine A chemical compound formed by heating aconitine ((1α,3α,6α,14α,16β)-20-ethyl-3,13-dihydroxy-1,6,16-trimethoxy-4-(methoxymethyl)-15-oxoaconitan-14-yl benzoate). pyroalizaric Derived from alizarin by heating. pyroanthocyanin A type of anthocyanin found in Monnina obtusifolia. pyroantimonate Any salt of pyroantimonic acid pyroantimonic Of or relating to pyroantimonic acid or its derivatives. pyroarsenate Any salt of pyroarsenic acid. pyroarsenic of, or relating to pyroarsenic acid or its derivatives pyroaurite A trigonal-hexagonal scalenohedral mineral containing carbon, hydrogen, iron, magnesium, and oxygen. pyroballogy The study of artillery; the practice of using artillery as a weapon. pyrobelonite An orthorhombic-dipyramidal dark red mineral containing hydrogen, lead, manganese, oxygen, and vanadium. pyrobitumen An amorphous fossilized petroleum mineraloid. pyrobituminous Of or relating to pyrobitumen. pyrobolic powered by an explosive pyrobolical pyrobolic pyrobolist A person who makes fireworks, rockets or artillery pyrobology pyroballogy pyroboly pyroballogy pyroborate Any salt of pyroboric acid. pyroboric Of or relating to pyroboric acid or its derivatives. pyrocarbon A ceramic form of carbon formed at high temperature from the breakdown of a hydrocarbon gas pyrocarbonate Any ester of the hypothetical pyrocarbonic acid, having general formula R-O-CO-O-CO-O-R pyrocatalysis catalysis by means of heat pyrocatalytic Relating to pyrocatalysis pyrocatechase Catechol 1,2-dioxygenase pyrocatechin pyrocatechol pyrocatechinic Related to, or derived from pyrocatechol pyrocatechol A dihydric phenol, benzene-1,2-diol, present in some tars. pyrocellulose nitrocellulose (cellulose nitrate) used in the manufacture of smokeless powder. Pyrocene The period of the Holocene/Anthropocene in which climate change causes more frequent and intense wildfires. pyrocentric Of or relating to the Pythagorean astronomical system, which posited that the Earth, Moon, Sun, and planets orbit an invisible "Central Fire". pyroceram a form of pyrex pyrochemical Of, related to, or produced by chemical reactions at elevated temperatures. pyrochemically In a pyrochemical way; by means of pyrochemistry. pyrochlore A mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium, (Na,Ca)₂Nb₂O₆(OH,F). pyrochloric Of or pertaining to pyrochlore. pyrochroid Any beetle in the family Pyrochroidae. pyrochroite A trigonal-hexagonal scalenohedral mineral containing hydrogen, manganese, and oxygen. pyrocitrate aconitate pyrocitric Describing any of the three unsaturated dicarboxylic acids obtained by the distillation of citric acid. pyroclast Solid matter ejected into the air by an active volcano. pyroclastic Mostly composed of rock fragments of volcanic origin or comminuted during an eruption. pyroclastically In a pyroclastic manner. pyroclimate A hot, dry climate in which fires are common pyroclimatic Relating to pyroclimates pyrocoll A tricyclic diketone with formula C₁₀H₆N₂O₂, a yellow, crystalline substance obtained by the distillation of gelatin. pyrocollodion A smokeless powder, a variant of nitrocellulose. pyroconductivity electrical conductivity elicited in a solid by heating pyroconvection Convection caused or intensified by a fire. pyroconvective Of, relating to, or caused by pyroconvection. pyroconversion A dry heat treatment of starch, causing dextrinization. pyrocotton Nitrated cotton, a high explosive that is the main constituent of smokeless powder. pyrocultural Of or relating to pyroculture. pyroculture The use of controlled burning, chiefly by hunter-gatherers, as a form of ecological engineering to manage plant and animal distribution in a habitat. pyrocumulonimbus An extreme manifestation of a pyrocumulus, generated by the heat of a wildfire, that often rises to the upper troposphere or lower stratosphere. pyrocumulus A dense cloud associated with fire or volcanic activity. pyrodin β-acetylphenylhydrazine when used as an antipyretic pyrodine An antipyretic compound having acetyl-phenyl-hydrozin as the active ingredient. pyrodiverse Of an environment or ecosystem, subject to variation in the kinds of fire experienced, whether produced by natural conditions or controlled burning. pyrodiversity A variation in the kinds of fire, whether produced by natural conditions or controlled burning, in an environment or ecosystem. Pyroeis The god of the wandering star Ἄρειος (Áreios), or planet Mars pyroelectric Of, relating to, or exhibiting pyroelectricity. pyroelectrical Of, pertaining to or produced by pyroelectricity pyroelectrically By means of pyroelectricity pyroelectricity The generation of electric charge as a result of a change in temperature. pyroelectrodynamic Of or pertaining to pyroelectrodynamics pyroelectrodynamics The use of pyroelectric forces to move streams of liquids, especially in order to form patterns of very small spots pyroelectrometallurgy pyroelectric metallurgy pyrogallate Any salt of the phenol pyrogallol when viewed as an acid. pyrogallein A poorly-characterised nitrogenous derivative of pyrogallol pyrogallic Of, or relating to pyrogallol (pyrogallic acid). pyrogallin pyrogallol pyrogallol A poisonous trihydroxy phenol, 1,2,3-trihydroxybenzene, C₆H₃(OH)₃, used as a photographic developer. pyrogallolic Pyrogallic. pyrogasification Combined pyrolysis and gasification. pyrogen Any substance that produces fever, or a rise in body temperature. pyrogenesis The production of fever. pyrogenetic Synonym of pyrogenic. pyrogenetically In a pyrogenetic manner. pyrogenic Generating or produced by heat, especially in the body; causing or caused by fever. pyrogenically In a pyrogenic manner. pyrogenicity The condition or extent of being pyrogenic. pyrogenous Synonym of pyrogenic.