This page gathers the 10,116 dictionary entries belonging to the domain “Chemistry”, as labelled by Wiktionary. Each word leads to its full entry: definitions, etymology, pronunciation, examples. Page 59 of 101: from “metaheinrichite” to “methylenedioxyphenethylamine”.
- metaheinrichite noun A monoclinic-sphenoidal yellowish green mineral containing arsenic, barium, hydrogen, oxygen, and uranium.
- metakahlerite noun A tetragonal-ditetragonal dipyramidal sulfur yellow mineral containing arsenic, hydrogen, iron, oxygen, and uranium.
- metakirchheimerite noun A tetragonal-ditetragonal dipyramidal light pink mineral containing arsenic, cobalt, hydrogen, oxygen, and uranium.
- metal carbonyl noun Any complex of a transition metal combined with carbon monoxide; they are typically volatile solids or liquids, soluble on common organic…
- metal-organic framework noun Any of several highly porous, crystalline substances having a cage structure of metal ions coordinated to organic compounds; they have an…
- metalammonium noun A hypothetical radical derived from ammonium by the substitution of metallic atoms in place of hydrogen.
- metalbumin noun A form of albumin found in ascitic and certain serous fluids, and sometimes regarded as a mixture of albumin and mucin.
- metallacyclobutane noun A derivative of cyclobutane (or of a derivative) in which a methylene group has been replaced by a metal atom
- metallacyclobutene noun A four-membered cyclic organometallic compound containing a metal atom bonded to two carbon atoms of an alkene.
- metallacyclopentane noun Any of a group of saturated organometallic heterocycles having four carbon atoms and one metal atom in the ring
- metallate noun Any anion or salt containing a metal atom ligated to one or more oxygen or other atoms, or to small groups; e.g. tungstate…
- metallic bond noun a chemical bond in which mobile electrons are shared over many nuclei; this leads to electrical conduction
- metalline noun A substance of variable composition, but resembling a soft, dark-coloured metal, used in the bearings of machines to reduce friction, and…
- metallocarbene noun A complex containing a metal ion M replacing one or both substituents at the divalent carbon atom of a carbene: (L)M–C–R
- metallocene noun Any of a class of organic compounds containing two cyclopentadienyl anions and a transition metal whose bonding involves overlap of ns and…
- metallochaperone noun Any of a family of proteins that move metal ions to specific sites within a cell, normally to bind with metalloenzymes and cofactors
- metalloid noun An element, such as silicon or germanium, intermediate in properties between that of a metal and a nonmetal; especially an elemental…
- metallometallation noun Any addition reaction in which atoms of two different metals are added across a double bond or triple bond
- metallophilic adj Characterized by attraction between metal ions
- metallopolymer noun Any polymer containing metal atoms in the repeating monomer, either as part of the backbone or in side chains
- metalloporphyrin noun Any compound, such as heme, formed by a combination of a porphyrin and a metal, often iron, copper, silver, zinc, or magnesium
- metalorganic adj organometallic
- metamer noun Any of a number of molecules that mutually exhibit metamerism
- metamerism noun Structural isomerism.
- metamict adj Having a disrupted crystal structure due to radiation damage; metamictic
- metamorphic noun A rock that has been changed from its original form by subjection to heat and/or pressure.
- metanephrine noun A metabolite of epinephrine (adrenaline) created by the action of catechol-O-methyl transferase on epinephrine.
- metaphosphoric acid noun an anhydrous form of phosphoric acid that exists as a polymeric glassy solid, (HPO₃)ₙ; used as a drying agent and in dental cement
- metapyrocatechase noun Catechol 2,3-dioxygenase, an enzyme that catalyzes the chemical reaction catechol + O₂ ⇌ 2-hydroxymuconate semialdehyde.
- metargon noun A supposed noble gas, once thought to exist in minute amounts in the atmosphere as a result of a flawed study of density spectra.
- metaschoderite noun A monoclinic-prismatic yellow orange mineral containing aluminum, hydrogen, oxygen, phosphorus, and vanadium.
- metasilicic acid noun A hypothetical acid derived from silicic acid by the removal of water.
- metastable adj Of or pertaining to a physical or chemical state that is relatively long-lived, but may decay to a lower energy state when slightly…
- metatartaric acid noun a polymeric lactone of variable composition obtained by heating tartaric acid; used to prevent precipitation in wine
- metatectic adj Describing isothermal reversible transformation of a solid mixture phase into a different solid phase plus a liquid phase during cooling…
- metathesis noun The double decomposition of inorganic salts.
- metatungstate noun Any salt of metatungstic acid; thus, any of certain tungstates that contain multiple atoms of tungsten e.g. W₄O₁₃²⁻.
- metavanmeersscheite noun An orthorhombic-pyramidal canary yellow mineral containing hydrogen, oxygen, phosphorus, and uranium.
- metavoltine noun A trigonal-rhombohedral mineral containing hydrogen, iron, oxygen, potassium, sodium, sulfur, and zinc.
- metaxin noun A mammalian mitochondrial protein.
- metaxylene noun That variety of xylene, or dimethyl benzene, in which the two methyl groups occupy the meta position with reference to each other. It is a…
- metenkephalin noun An endogenous opioid peptide neurotransmitter found naturally in many parts of the animal and human body; one of the two forms of…
- metepa noun A chemosterilant also used in creaseproofing and flameproofing textiles, a methyl derivative of tepa.
- methacrylate noun Any salt or ester of methacrylic acid, especially an ester used in the manufacture of resins and plastics.
- methacrylic acid noun A colourless liquid, an unsaturated organic acid, used in the manufacture of resins and plastics, with the chemical formula CH₂:C(CH₃)COOH.
- methal noun A white waxy substance, found in small quantities in spermaceti. It may be the same as myristyl alcohol.
- methane noun The simplest aliphatic hydrocarbon, CH₄, being a constituent of natural gas, and one of the most abundant greenhouse gases.
- methanesulfonamide noun The sulfonamide of methanesulfonic acid, CH₃SO₂NH₂, used as an intermediate in the synthesis of pharmaceuticals etc
- methanofuran noun Any of a family of chemical compounds found in methanogenic archaea, featuring a 2-aminomethylfuran linked to a phenoxy group.
- methanoic acid noun The simplest carboxylic acid, HCOOH, a colorless, corrosive liquid with a sharp odor; it is present in the stings of ants, bees and…
- methanol noun The simplest aliphatic alcohol, CH₃OH; a colourless, toxic, inflammable liquid, used as a solvent, antifreeze, in the chemical industry…
- methanolic noun A compound that contains methanol.
- methanophenazine noun The phenazine derivative 2-{[(3S,6E,10E,14E)-3,7,11,15,19-pentamethylicosa-6,10,14,18-tetraen-1-yl]oxy}phenazine
- methcathinone noun α-methylamino-propiophenone, a psychoactive stimulant sometimes used as a recreational drug.
- methemoglobin noun An oxidized form of hemoglobin, containing ferric rather than ferrous iron, that cannot transport oxygen.
- methenolone noun A long-acting anabolic steroid with limited androgenic properties, having the chemical formula C₂₀H₃₀O₂
- methenyl noun The hypothetical hydrocarbon radical CH, regarded as an essential residue of certain organic compounds.
- methenyltetrahydromethanopterin cyclohydrolase noun An enzyme found in methanogenic microorganisms that catalyzes the conversion of methenyl-tetrahydromethanopterin to…
- methiodide noun Any of a class of compounds, of general formula R₂C(CH₃)I, formed by the reaction of methyl iodide with an aldehyde or ketone
- methionic acid noun The disulfonic acid of methane, prepared by treatment of methanesulfonic acid with oleum. CH₂.(SO₃H)₂.
- methionine noun A sulphur-containing amino acid, C₅H₁₁NO₂S, in L- and D-forms.
- methionyl-lysyl-bradykinin noun A short peptide fragment derived from kininogen proteins in blood, formed by enzymatic cleavage. It is an extended form of bradykinin with…
- methol noun methyl alcohol; wood spirit
- methoxide noun The anion CH₃O⁻ derived from methanol by the loss of a proton.
- methoxsalen noun A furanocoumarin drug used to treat psoriasis, eczema, vitiligo, and some cutaneous lymphomas in conjunction with exposing the skin to…
- methoxydechlorination noun A chemical reaction that involves removing a chlorine atom from a molecule and replacing it with a methoxy group.
- methoxydimethyltryptamine noun Any of several isomeric methoxy derivatives of dimethyltryptamine; any compound derived from any of these
- methoxyfenozide noun The carbohydrazide insecticide N'-(tert-butyl )-N'-(3,5-dimethylbenzoyl)-3-methoxy-2-methylbenzohydrazide
- methyacrylate noun Any salt or ester of methacrylic acid
- methyl noun The univalent hydrocarbon radical, CH₃-, formally derived from methane by the loss of a hydrogen atom; a compound or part of a compound…
- methyl mercaptan noun The mercaptan analogue of methyl alcohol; i.e. the compound CH₃SHl used to impart an odor to natural gas.
- methyl methacrylate noun The methyl ester of methacrylic acid, CH₂:C(CH₃)COOCH₃, used as a monomer in the manufacture of polymethyl methacrylate plastics.
- methyl methyacrylate noun A chemical compound C₅O₂H₈, mostly used as a monomer for the production of the transparent plastic polymethyl methacrylate (PMMA).
- methyl rubber noun A polymer of dimethylbutadiene, invented in Germany and historically used as one of the first synthetic rubber during World War I.
- methyl tert-butyl ether noun C₅H₁₂O ; an organic compound used to increase octane numbers of gasoline, through added oxygen, as an anti-knock additive
- methylalumination noun A chemical reaction involving the addition of a methyl group and an aluminum moiety to a substrate, typically an alkyne or alkene…
- methylanthraquinone noun Any methyl derivative of an anthraquinone, but especially 1-methylanthraquinone or 2-methylanthraquinone
- methylarginine noun Any methyl derivative of arginine, but especially 2-amino-5-[(N’-methylcarbamimidoyl)amino]pentanoic acid, which is an inhibitor of nitric…
- methylate noun The anion -O-CH₃⁻ derived from methanol by loss of a proton; any salt containing this anion
- methylated adj subject to methylation
- methylation noun The addition of a methyl group to a molecule.
- methylator noun Anything that causes methylation.
- methylbenzidine noun Any methyl derivative of benzidine, especially 3-methylbenzidine:- (4-(4-aminophenyl)-2-methylaniline)
- methylcellulose noun A white powdery substance, obtained by the methylation of cellulose, that swells in contact with water to form a gel; it has many…
- methylchloroform noun The chloroalkane 1,1,1-trichloroethane, once produced industrially as a solvent, banned due to ozone layer effects.
- methylchloroisothiazolinone noun A synthetic preservative used in many cosmetics, personal care products and cleaners to stop bacteria, mold and fungi. It is effective at…
- methylcyclohexane noun The methyl derivative of cyclohexane, used in organic synthesis and as a solvent for cellulose ethers
- methylcyclopentadiene noun Any of three isomeric cyclic diolefins, (methyl derivatives of cyclopentadiene), the organic precursor to the methylcyclopentadienyl-ligand…
- methylcyclopentadienyl manganese tricarbonyl noun (CH₃C₅H₄)Mn(CO)₃ ; an octane number boosting additive to unleaded gasoline to replace tetra-ethyl lead as an anti-knock component
- methylecgonidine noun A chemical intermediate derived from ecgonine or cocaine; a pyrolysis product formed when crack cocaine is smoked.
- methylene noun The divalent group –CH₂– in which the free valencies are part of single bonds.
- methylenedioxy noun A functional group with the structural formula R-O-CH₂-O-R', connected to the rest of a molecule by two chemical bonds.
- methylenedioxyamphetamine noun A synthetic compound in the amphetamine family with a methylenedioxy group attached to its aromatic ring. It acts mainly by increasing the…
- methylenedioxybenzylamphetamine noun A synthetic organic chemical related to amphetamines. It has a benzene ring, a methylenedioxy group, and an amine side chain, but it is…
- methylenedioxybenzylpiperazine noun A synthetic psychoactive chemical in the piperazine family. It’s structurally related to BZP and contains a methylenedioxy group similar to…
- methylenedioxycathinone noun A synthetic cathinone drug and an entactogen of the phenethylamine and amphetamine families, with formula C₁₀H₁₁NO₃.
- methylenedioxycyclopropylmethylamphetamine noun A synthetic organic compound related to MDMA and MDA with formula C₁₄H₁₉NO₂. It was created in research settings to study how small…
- methylenedioxyethylamphetamine noun A synthetic psychoactive drug in the amphetamine family that increases serotonin activity in the brain, producing effects such as mild…
- methylenedioxymethamphetamine noun A synthetic drug that affects brain chemicals involved in mood, energy, and social connection, often producing feelings of euphoria…
- methylenedioxyphenethylamine noun A chemical compound in the phenethylamine family that has a methylenedioxy group on its benzene ring. It is structurally related to MDMA…