pyrazolopyrimidine
Any of a class of sedative and anxiolytic drugs with similar effects to benzodiazepines, their molecules typified by the linked six-sided pyrimidine ring and five-sided pyrazole ring.

pyrazolopyrimidines
plural of pyrazolopyrimidine

pyrazolos
plural of pyrazolo

pyrazolyl
A radical derived from pyrazole

pyrazolyls
plural of pyrazolyl

pyrazyl
The radical derived from pyrazole

pyrenylene
Any cyclic polymer of pyrene

pyrenylenes
plural of pyrenylene

pyrethroid
Any of several synthetic insecticides having a structure based on pyrethrin.

pyrethroids
plural of pyrethroid

pyrethrozine
A particular pyrethroid

pyrex
A kind of heat-resistant borosilicate glass, made by mixing a high concentration of boron oxides into the molten glass to reduce its thermal expansion coefficient.
Any borosilicate glass.
Any glass capable of withstanding high temperatures, such as tempered glass suitable for cooking.

pyrgom
A variety of the mineral pyroxene.

pyridazine
A diazine in which the two nitrogen atoms are in the ortho- positions; many of its derivatives are pharmaceuticals, herbicides etc

pyridazines
plural of pyridazine

pyridinamine
Any of three isomeric amino derivatives of pyridine; many of their derivatives are pharmaceuticals

pyridinamines
plural of pyridinamine

pyridinediyl
Any diradical derived from pyridine

pyridinone
An unsaturated cyclic amide formally derived from pyridine

pyridinones
plural of pyridinone

pyridinyl
A univalent C- radical derived from pyridine or a pyridinol

pyridinylpiperazine
1-(2-pyridinyl)piperazine, a piperazine derivative.

pyridinylpiperazines
plural of pyridinylpiperazine

pyridinyls
plural of pyridinyl

pyrido
A pyridyl radical as a substituent

pyridos
plural of pyrido

pyridoxal
One of the three natural forms of vitamin B6

pyridoxals
plural of pyridoxal

pyridoxin
Alternative form of pyridoxine.

pyridoxine
A derivative of pyridine, 4,5-bis(hydroxymethyl)-2-methylpyridin-3-ol, found in fish, liver, cereals and yeast, and essential for the metabolism of amino acids and starch.

pyridoxines
plural of pyridoxine

pyridoxins
plural of pyridoxin

pyridylamide
An ion derived from pyridylamine, by the removal of a hydrogen ion

pyridylamino
Any pyridyl derivative of an amino group

pyridylbenzene
Synonym of phenylpyridine.

pyridylbenzenes
plural of pyridylbenzene

pyridylglycine
An N-pyridyl derivative of glycine

pyridylglycines
plural of pyridylglycine

pyridylmethyl
Any pyridyl derivative of a methyl group

pyridylmethyls
plural of pyridylmethyl

pyridylsulfoximine
Any pyridyl sulfoximine

pyridylsulfoximines
plural of pyridylsulfoximine

pyridyne
The pyridine analogue of benzyne.

pyrilamine
Mepyramine.

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

pyrimidines
plural of pyrimidine

pyrimidinetrione
Any derivative of pyrimidine that has three carbonyl groups in the ring; many are barbiturates

pyrimidinetriones
plural of pyrimidinetrione

pyrimidinone
Any of several heterocyclic ketones derived from pyrimidine.

pyrimidinones
plural of pyrimidinone

pyrimidinylpiperazine
1-(2-pyrimidinyl)piperazine, a piperazine derivative.

pyrimidinylpiperazines
plural of pyrimidinylpiperazine

pyrimidodiazepine
Any heterocycle formed by fusion of a pyrimidone and a diazepine

pyrimidodiazepines
plural of pyrimidodiazepine

pyrimidopteridine
A tricyclic heterocycle formed by fusion of a pyrimidine and a pteridine

pyrimidopteridines
plural of pyrimidopteridine

pyrimiphos
Alternative form of pirimiphos.

pyrin
A protein that regulates the body's inflammatory response to trauma.

pyrithioxine
pyritinol

pyritology
the art of using a blowpipe, and often a charcoal block, to analyse minerals and metal salts

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).

pyrocarbon
A ceramic form of carbon formed at high temperature from the breakdown of a hydrocarbon gas

pyrocatalysis
catalysis by means of heat

pyrocatechase
Catechol 1,2-dioxygenase

pyrocatechases
plural of pyrocatechase

pyrocellulose
nitrocellulose (cellulose nitrate) used in the manufacture of smokeless powder.

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.

pyrocumulonimbi
plural of pyrocumulonimbus

pyrocumulonimbus
An extreme manifestation of a pyrocumulus, generated by the heat of a wildfire, that often rises to the upper troposphere or lower stratosphere.

pyroelectrometallurgy
pyroelectric metallurgy

pyrogallein
A poorly-characterised nitrogenous derivative of pyrogallol

pyrogallin
pyrogallol

pyroglobulin
An immunoglobulin that coagulates when heated

pyroglobulins
plural of pyroglobulin

pyroglutamase
An enzyme that catalyzes hydrolysis of pyroglutamic acid.

pyroglutamination
Reaction with pyroglutamate or other derivative of pyroglutamic acid

pyrokinin
A neuropeptide that regulates some pheromones in some insects

pyrokinins
plural of pyrokinin

pyrolignate
pyrolignite

pyrolignite
A crude acetate produced by treating pyroligneous acid with a metal or basic compound.

pyrolignites
plural of pyrolignite

pyrolisis
Misspelling of pyrolysis.

pyrolization
Synonym of pyrolysis.

pyrology
the scientific study of the effects of heat or flame, often in regards to explosives or chemical compounds.

pyrolysis
The decomposition of a material or compound due to heat, in the absence of oxygen or other reagents.

pyropheophytin
Any of a group of substances, produced by heating chlorophyll, typically present in used olive oil

pyropheophytins
plural of pyropheophytin

pyrophosphorolysis
The lysis of the bonds between the phosphate moieties of a pyrophosphate.

pyrophosphoryl
A (univalent to tetravalent) radical derived from pyrophosphoric acid by removing one to four hydroxy groups

pyrophosphorylyses
plural of pyrophosphorylysis

pyrophosphorylysis
The cleavage of a nucleoside from a nucleotide by breaking the bond to the phosphate group by a reaction with pyrophosphorylase.

pyroplastic
Burned pieces of waste plastic that are present as a type of pollution in the environment.

pyroplastics
plural of pyroplastic

pyroptosis
A form of programmed cell death associated with antimicrobial responses during inflammation.

pyroptosome
A supramolecular assembly of adaptor protein dimers that mediates inflammatory cell death.

pyroptosomes
plural of pyroptosome

pyroretin
A resinous form of asphalt

pyrosilver
electroplated ware in which the silver is made to sink into the pores of the plated baser metal by the action of heat

pyrosulfuryl
A divalent group -S₂O₅-

pyrotoxin
Any of several pyrogenic bacterial toxins.
Any toxic agent produced by combustion.

pyrotoxins
plural of pyrotoxin

pyroxamine
A chemical analog of diphenylpyraline.

pyroxanthin
A yellow, crystalline substance obtained from creosote etc; it seems to be a polycyclic aromatic hydrocarbon.

pyroxanthogen
The component of wood tar from which pyroxanthin is obtained

pyroxidine
Misspelling of pyridoxine.

pyroxyl
Archaic form of pyroxylin.

pyroxyline
Archaic form of pyroxylin.

pyrozone
A preparation of ether peroxide used as a mouthwash.

pyrrolidinedione
A derivative of pyrrolidine having two carbonyl groups

pyrrolidinediones
plural of pyrrolidinedione

pyrrolidinopentiophenone
Any pyrrolidine derivative of pentiophenone, but especially the α- isomer which is the synthetic stimulant flikka

pyrrolidinophenone
Any of a class of recreational designer drugs with psychostimulant effects.

pyrrolidinophenones
plural of pyrrolidinophenone

pyrrolidinyl
A radical derived from pyrrolidine

pyrrolidinyloxy
The N-oxygen free radical derived from pyrrolidine

pyrrolidinyloxys
plural of pyrrolidinyloxy