al·​kyl·​am·​mo·​ni·​um | \¦al-kə-lə-¦mō-nē-əm, -nyəm\
plural alkylammoniums

Definition of alkylammonium 

: a compound of one or more alkyl radicals combined with ammonium The organic-inorganic crystal layers are made up of a two-dimensional network of corner-sharing octahedra self-organized quantum wells and layers of alkylammonium chains.— Sunny Bains, Electronic Engineering Times, 19 Mar. 2001

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First Known Use of alkylammonium

1887, in the meaning defined above

History and Etymology for alkylammonium

alkyl entry 1 + ammonium

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The first known use of alkylammonium was in 1887

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