Quaternary-ammonium-compound definitions

Any of a group of compounds composed of a cation, in which a central nitrogen atom is joined to four organic groups, and any of various anions, used as antiseptics, solvents, and emulsifying agents.
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Any of a class of compounds in which the four hydrogen atoms of the ammonium radical are replaced by other groups, generally organic radicals: used as solvents, disinfectants, etc.
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Any of a group of compounds composed of a cation, in which a central nitrogen atom is joined to four organic groups, and any of various anions, used as antiseptics, solvents, and emulsifying agents.
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(chemistry) An amine derivative, containing four radicals, of general formula R1R2R3R4-N+X-; the radicals may be the same, different, or part of a ring; X is any univalent anion such as OH-.
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