cetylpyridinium chloride
noun
ce·tyl·py·ri·din·i·um chloride
ˌsēt-ᵊl-ˌpī-rə-ˌdin-ē-əm-
: a white powder consisting of a hydrated quaternary ammonium salt C21H38ClN·H2O and used as a cationic detergent and antiseptic
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Merriam-Webster unabridged
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