Relating to chemistry, or the interactions of substances as studied in chemistry
An explosive device designed to spread toxic or noxious chemicals; a chemical weapon in the form of a bomb.
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.
A refined lead of high purity suitable for use with industrial chemicals.
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.
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.
A narcotic drug or drugs used to subdue a disruptive person, typically a patient in an institution
(Of farming or cultivation) not involving the use of artificial chemicals, especially pesticides or fertilizers
Not containing or involving the use of artificial chemicals
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 toilet.
The point or distance at which a lens or optical instrument focuses light on a photographic film.
A substance present in a geological deposit which is believed to have originated in the biochemical processes of ancient living organisms; a biomarker.
A chemical substance used as a marker; a taggant.
Any faculty that allows an organism to perceive chemical substances, especially (in most vertebrates) the senses of taste and smell.
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.
A weapon that depends for its effect on the release of toxic or noxious chemicals; also occasionally in extended use; frequently in plural.
An industrial establishment or premises used for the manufacture of chemicals or for carrying out chemical processes.
Of or relating to the effects which chemical properties and changes have on optical phenomena such as the absorption, transmission,and polarization of light.
A toilet that is not connected to a sewage system but has a compartment in which waste is treated with chemicals for temporary storage
The branch of science concerned with the application of chemical methods and tools to biological research.
A continuous increase or decrease in the concentration of a particular chemical substance found on passing from one point to another.
The process of chemical mixing.
(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.
The use of chemical weapons in a war or conflict; also occasionally in extended use.
Comprising mechanics and chemistry; (of phenomena) relating partly to mechanics and partly to chemistry.
Of or relating to pneumatic chemistry; †pneumato-chemical trough = pneumatic trough (obsolete).
Of or relating to quantum chemistry.
Of or relating to radiation chemistry.
A thermodynamic function expressing the ability of an uncharged atom or molecule in a chemical system to perform physical work
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
Relating to physics and chemistry or to physical chemistry
The use of drugs to lower levels of sex hormones in males, especially in order to suppress sexual urges or to treat cancer.
A fire extinguisher which discharges a chemical powder or liquid.
A fertilizer consisting of inorganic chemicals (typically compounds of nitrogen and phosphorus).
= chemical pulp.
A chemical manufactured in relatively small quantities for specialist purposes.
Addiction to a mood- or mind-altering drug, such as alcohol or cocaine
The branch of engineering concerned with the design and operation of industrial chemical plants
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
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.
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.
Symptoms or illness attributed to hypersensitivity to a variety of common environmental chemicals.
A chemical used in agriculture, such as a pesticide or a fertilizer
A strong force of attraction holding atoms together in a molecule or crystal, resulting from the sharing or transfer of electrons
Chemical substances prepared to a very high degree of purity for use in research and industry
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