tetramethylammonium

noun
tet·​ra·​meth·​yl·​am·​mo·​ni·​um | \ˌte-trə-ˌmeth-əl-ə-ˈmō-nē- əm \

Medical Definition of tetramethylammonium 

: the quaternary ammonium ion (CH3)4N+ containing four methyl groups

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