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chemical British & World English

Relating to chemistry, or the interactions of substances as studied in chemistry

chemical bomb British & World English

An explosive device designed to spread toxic or noxious chemicals; a chemical weapon in the form of a bomb.

chemical fog British & World English

Photography a diffuse background darkening in a photographic film or paper caused by a chemical reaction with substances in the developing solution, the atmosphere, etc.

chemical lead British & World English

A refined lead of high purity suitable for use with industrial chemicals.

chemical pulp British & World English

Wood pulp produced by a process in which wood chips are heated with chemicals that break down the lignin binding cellulose fibres, without significant degradation of the fibres themselves; also called chemical wood pulp.

chemical ray British & World English

An invisible constituent of light which acts on a photographic plate and has other chemical effects; an actinic ray; an ultraviolet ray; usually in plural.

chemical cosh British & World English

A narcotic drug or drugs used to subdue a disruptive person, typically a patient in an institution

chemical-free British & World English

(Of farming or cultivation) not involving the use of artificial chemicals, especially pesticides or fertilizers

non-chemical British & World English

Not containing or involving the use of artificial chemicals

chemical agent British & World English

A chemical substance producing a specific effect, especially when intentionally used for this reason; (now often) specifically a substance used to incapacitate, injure, or kill people, or cause damage to crops, etc.; a chemical weapon.

chemical focus British & World English

The point or distance at which a lens or optical instrument focuses light on a photographic film.

chemical fossil British & World English

A substance present in a geological deposit which is believed to have originated in the biochemical processes of ancient living organisms; a biomarker.

chemical marker British & World English

A chemical substance used as a marker; a taggant.

chemical sense British & World English

Any faculty that allows an organism to perceive chemical substances, especially (in most vertebrates) the senses of taste and smell.

chemical symbol British & World English

A letter or other graphic mark used as an abbreviation in chemistry; specifically a letter or two (rarely three) letters denoting a chemical element (as N for nitrogen, Fe for iron) or an organic group (as R for an alkyl group, Me for methyl), in chemical formulae or in other contexts.

chemical weapon British & World English

A weapon that depends for its effect on the release of toxic or noxious chemicals; also occasionally in extended use; frequently in plural.

chemical works British & World English

An industrial establishment or premises used for the manufacture of chemicals or for carrying out chemical processes.

optico-chemical British & World English

Of or relating to the effects which chemical properties and changes have on optical phenomena such as the absorption, transmission,and polarization of light.

chemical toilet British & World English

A toilet that is not connected to a sewage system but has a compartment in which waste is treated with chemicals for temporary storage

chemical biology British & World English

The branch of science concerned with the application of chemical methods and tools to biological research.

chemical gradient British & World English

A continuous increase or decrease in the concentration of a particular chemical substance found on passing from one point to another.

chemical mixture British & World English

The process of chemical mixing.

chemical physics British & World English

(Originally) the branch of chemistry concerned with the physical properties of chemical substances; physical chemistry; (in later use usually) specifically the branch of science which applies techniques and concepts derived from physics (such as spectroscopy, quantum mechanics, etc.) to investigate chemical phenomena.

chemical warfare British & World English

The use of chemical weapons in a war or conflict; also occasionally in extended use.

mechanico-chemical British & World English

Comprising mechanics and chemistry; (of phenomena) relating partly to mechanics and partly to chemistry.

pneumato-chemical British & World English

Of or relating to pneumatic chemistry; †pneumato-chemical trough = pneumatic trough (obsolete).

quantum-chemical British & World English

Of or relating to quantum chemistry.

radiation-chemical British & World English

Of or relating to radiation chemistry.

chemical potential British & World English

A thermodynamic function expressing the ability of an uncharged atom or molecule in a chemical system to perform physical work

chemical reaction British & World English

A process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction

physico-chemical British & World English

Relating to physics and chemistry or to physical chemistry

chemical castration British & World English

The use of drugs to lower levels of sex hormones in males, especially in order to suppress sexual urges or to treat cancer.

chemical extinguisher British & World English

A fire extinguisher which discharges a chemical powder or liquid.

chemical fertilizer British & World English

A fertilizer consisting of inorganic chemicals (typically compounds of nitrogen and phosphorus).

speciality chemical British & World English

A chemical manufactured in relatively small quantities for specialist purposes.

chemical dependency British & World English

Addiction to a mood- or mind-altering drug, such as alcohol or cocaine

chemical engineering British & World English

The branch of engineering concerned with the design and operation of industrial chemical plants

chemical weathering British & World English

The erosion or disintegration of rocks, building materials, etc., caused by chemical reactions (chiefly with water and substances dissolved in it) rather than by mechanical processes

chemical oxygen demand British & World English

The amount of oxygen required to oxidize fully the organic compounds contained in a volume of water, used as measure of water quality; abbreviated COD.

chemical vapour deposition British & World English

A process used to produce high-purity solid materials, especially for the electronics industry, in which, typically, a layer of the desired substance is deposited on a solid substrate by exposing the latter to volatile chemical compounds that decompose on or react with it; abbreviated CVD.

multiple chemical sensitivity British & World English

Symptoms or illness attributed to hypersensitivity to a variety of common environmental chemicals.

agrochemical British & World English

A chemical used in agriculture, such as a pesticide or a fertilizer

chemical bond in bond British & World English

A strong force of attraction holding atoms together in a molecule or crystal, resulting from the sharing or transfer of electrons

fine chemicals British & World English

Chemical substances prepared to a very high degree of purity for use in research and industry

chemical element in element British & World English

Each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter. Each element is distinguished by its atomic number, i.e. the number of protons in the nuclei of its atoms

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