tetraethylammonium
noun
tet·ra·eth·yl·am·mo·ni·um
ˌte-trə-ˌeth-əl-ə-ˈmō-nē-əm
: a quaternary ammonium ion (C2H5)4N+ containing four ethyl groups
also
: a salt of this ion (as the deliquescent crystalline chloride used as a ganglionic blocking agent)
—abbreviation TEA
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Merriam-Webster unabridged
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