quaternary ammonium salt

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quaternary ammonium salt

[′kwät·ən‚er·ē ə¦mō·nē·əm ′sȯlt]
(organic chemistry)
A nitrogen compound in which a central nitrogen atom is joined to four organic radicals and one acid radical, for example, hexamethonium chloride; used as an emulsifying agent, corrosion inhibitor, and antiseptic.