| 单词 | chemical |
| 释义 | chemical (once / 239 pages) adjn A chemical is any mix of raw elements: hydrogen + oxygen produce the chemical water. Water is created by a change in the chemistry of hydrogen and oxygen atoms — a chemical change. Be cautious of the negative reaction people have to chemical substances. Chemicals often bring to mind deadly substances, such as asbestos or deadly chemical weapons. But many chemicals are part of our everyday life. Our lives would be drastically different without chemical compounds — think of the infection that would result if we didn't have the chemical hydrogen peroxide for cleaning out cuts. WORD FAMILYchemical: chemically, chemicals USAGE EXAMPLESFour minors died from chemical gas poisoning after a resident tried to fumigate a home in Amarillo, Texas with pesticide, fire officials told local media. Reuters(Jan 02, 2017) The scientists told the BBC television network that they believe the gut bacteria release chemicals that over-activate immune cells in the brain. Washington Times(Jan 02, 2017) Cheese proteins contain casomorphins, chemical compounds that attach to the same opiate receptors in the brain as heroin or morphine. New York Times(Dec 28, 2016) 1adj of or made from or using substances produced by or used in reactions involving atomic or molecular changes chemical fertilizer 2adj relating to or used in chemistry chemical engineer chemical balance Syn chemic 3n material produced by or used in a reaction involving changes in atoms or molecules Syn|Hypo|Hyper chemical substance explosive a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck reactanta chemical substance that is present at the start of a chemical reaction Alar, daminozidea chemical sprayed on fruit trees to regulate their growth so the entire crop can be harvested at one time carrieran inactive substance that is a vehicle for a radioactive tracer of the same substance and that assists in its recovery after some chemical reaction bacteriacide, bactericideany chemical agent that destroys bacteria carbon tetrahalidecompounds composed of 1 carbon and 4 halogen molecules congenera minor chemical constituent that gives a wine or liquor its distinctive character chemical compound, compound(chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight soil conditionera chemical substance used to improve the structure of the soil and increase its porosity fertiliser, fertilizer, plant foodany substance such as manure or a mixture of nitrates used to make soil more fertile fluxa substance added to molten metals to bond with impurities that can then be readily removed fumiganta chemical substance used in fumigation herbicide, weed killer, weedkillera chemical agent that destroys plants or inhibits their growth intermediatea substance formed during a chemical process before the desired product is obtained fractiona component of a mixture that has been separated by a fractional process larvicidea chemical used to kill larval pests pesticidea chemical used to kill pests (as rodents or insects) phytochemicala chemical substance obtained from plants that is biologically active but not nutritive producta chemical substance formed as a result of a chemical reaction restrainera chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film stabilizera chemical that is added to a solution or mixture or suspension to maintain it in a stable or unchanging state softenera substance added to another to make it less hard burster, bursting charge, charge, explosive chargea quantity of explosive to be set off at one time conditionera substance used in washing (clothing or hair) to make things softer explosive compounda compound that is explosive explosive mixturea mixture that is explosive impulse explosive, propellant explosivean explosive that is used to propel projectiles from guns or to propel rockets and missiles or to launch torpedos and depth charges load, payload, warheadthe front part of a guided missile or rocket or torpedo that carries the nuclear or explosive charge or the chemical or biological agents vanillina crystalline compound found in vanilla beans and some balsam resins; used in perfumes and flavorings acceptor(chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated adducta compound formed by an addition reaction antiknockany of various compounds that are added to gasoline to reduce engine knocking plasticiser, plasticizera substance added to plastics or other materials to make them more pliable acaracide, acaricidea chemical agent used to kill mites Agent Orangea herbicide used in the Vietnam War to defoliate forest areas arsenicala pesticide or drug containing arsenic acidany of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt arsenidea compound of arsenic with a more positive element HN, azoimide, hydrazoic acid, hydrogen azidea colorless explosive liquid that is volatile and poisonous and foul-smelling hydrogen cyanidea highly poisonous gas or volatile liquid that smells like bitter almonds; becomes a gas at around 90 degree Fahrenheit and is most dangerous when inhaled; the anhydride of hydrocyanic acid; used in manufacturing hydrolysatea product of hydrolysis anionic compounda compound characterized by an active anion alkali, baseany of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water binary compoundchemical compound composed of only two elements atrazinea synthetic compound derived from triazine that is widely used as an agricultural herbicide taurinea colorless crystalline substance obtained from the bile of mammals chromogena compound that can be converted to a pigment manganese tetroxidean oxide of manganese found naturally as hausmannite monomera simple compound whose molecules can join together to form polymers ozonideany of a class of unstable chemical compounds resulting from the addition of ozone to a double bond in an unsaturated compound carotenoidany of a class of highly unsaturated yellow to red pigments occurring in plants and animals organic compoundany compound of carbon and another element or a radical amminea complex inorganic compound that contains ammonia molecules anhydridea compound formed from one or more other compounds in a reaction resulting in removal of water azidea chemical compound containing the azido group combined with an element or radical bitter principleany one of several hundred compounds having a bitter taste; not admitting of chemical classification buffer(chemistry) an ionic compound that resists changes in its pH calcium-cyanamide, cyanamidea compound used as a fertilizer and as a source of nitrogen compounds carbonyla compound containing metal combined with carbon monoxide carbon disulfidea toxic colorless flammable liquid (CS2); used in the manufacture of rayon and cellophane and carbon tetrachloride and as a solvent for rubber cofactora substance (as a coenzyme) that must join with another to produce a given result cementite, iron carbidea chemical compound that is a constituent of steel and cast iron; very hard and brittle chloropicrin, nitrochloroforma heavy colorless insoluble liquid compound that causes tears and vomiting; used as a pesticide and as tear gas complex, coordination compounda compound described in terms of the central atom to which other atoms are bound or coordinated allomorphany of several different crystalline forms of the same chemical compound corrosivea substance having the tendency to cause corrosion (such a strong acids or alkali) aluminatea compound of alumina and a metallic oxide defolianta chemical that is sprayed on plants and causes their leaves to fall off depilatorya chemical (usually a sulfide) used to remove hair or wool or bristles from hides derivativea compound obtained from, or regarded as derived from, another compound dimera compound whose molecules are composed of two identical monomers high explosivea powerful chemical explosive that produces gas at a very high rate low explosivean explosive with a low rate of combustion organic, organic fertiliser, organic fertilizera fertilizer that is derived from animal or vegetable matter soldering fluxflux applied to surfaces that are to be joined by soldering; flux cleans the surfaces and results in a better bond potassium bromidea white crystalline salt (KBr) used as a sedative and in photography filtratethe product of filtration; a gas or liquid that has been passed through a filter fixer, fixing agenta chemical compound that sets or fixes something (as a dye or a photographic image) flavonea colorless crystalline compound that is part of a number of white or yellow plant pigments flavonoidany of a large class of plant pigments having a chemical structure based on or similar to flavone formulation, preparationa substance prepared according to a formula enantiomer, enantiomorpheither one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical exotherma compound that gives off heat during its formation and absorbs heat during its decomposition goitrogenany substance (such as thiouracil) that induces the formation of a goiter benzofuran, coumarone, cumaronea colorless oily compound extracted from coal tar and used in manufacturing synthetic resins synthetic, synthetic substancea compound made artificially by chemical reactions hydrateany compound that contains water of crystallization hydroxidea chemical compound containing the hydroxyl group incensea substance that produces a fragrant odor when burned inorganic compoundany compound that does not contain carbon insect powder, insecticidea chemical used to kill insects repellant, repellenta chemical substance that repels animals repellant, repellenta compound with which fabrics are treated to repel water iodocompounda compound containing the covalent iodine radical isomera compound that exists in forms having different arrangements of atoms but the same molecular weight hydrated oxide, hydroxidea compound of an oxide with water linurona herbicide that kills weeds without harming vegetables menthola crystalline compound that has the cool and minty taste and odor that occurs naturally in peppermint oil; used as a flavoring and in medicine to relieve itching, pain, and nasal congestion nitrogen mustarda toxic compound resembling mustard gas in structure; important in cancer treatment nitridea compound containing nitrogen and a more electropositive element (such as phosphorus or a metal) oxideany compound of oxygen with another element or a radical paraquata poisonous yellow solid used in solution as a herbicide pediculicidea chemical agent that kills lice phosphinea colorless gas with a strong fishy smell; used as a pesticide polymera naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers preservativea chemical compound that is added to protect against decay or decomposition benzoquinone, quinoneany of a class of aromatic yellow compounds including several that are biologically important as coenzymes or acceptors or vitamins; used in making dyes salta compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal) causticany chemical substance that burns or destroys living tissue nitrateany compound containing the nitrate group (such as a salt or ester of nitric acid) gunpowder, powdera mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks Ballistite, smokeless powderan explosive (trade name Ballistite) that burns with relatively little smoke; contains pyrocellulose and is used as a propellant chlorideany compound containing a chlorine atom heterocycle, heterocyclic, heterocyclic compounda compound containing a heterocyclic ring scabicidea drug that destroys the itch mite that causes scabies sheep dipa liquid mixture containing pesticides in which sheep are dipped to kill parasites silicideany of various compounds of silicon with a more electropositive element or radical siloxaneany of a large class of compounds that have alternate silicon and oxygen atoms silvexa herbicide that is effective in controlling woody plants but is toxic to animals simazinea herbicide used to control weeds (especially among crops) solvatea compound formed by solvation (the combination of solvent molecules with molecules or ions of the solute) spraya pesticide in suspension or solution; intended for spraying water softenera substance (such as sodium chloride) that lessens the hardness of water by replacing calcium and magnesium ions with sodium ions and so gives the water more efficient sudsing power sternutator, sternutatorya chemical substance that causes sneezing and coughing and crying strippera chemical compound used to remove paint or varnish sulfide, sulphidea compound of sulphur and some other element that is more electropositive tellurideany binary compound of tellurium with other more electropositive elements tenderiser, tenderizera substance (as the plant enzyme papain) applied to meat to make it tender tetrachlorideany compound that contains four chlorine atoms per molecule nitramine, tetryla yellow crystalline explosive solid that is used in detonators triazineany of three isomeric compounds having three carbon and three nitrogen atoms in a six-membered ring U308, yellowcakean impure mixture of uranium oxides obtained during the processing of uranium ore enamela colored glassy compound (opaque or partially opaque) that is fused to the surface of metal or glass or pottery for decoration or protection pregnanediola compound found in women's urine during certain phases of the menstrual cycle and in the urine of pregnant women material, stuff the tangible substance that goes into the makeup of a physical object |
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