ˌheksəməˈthōnēəm noun
( -s )
Etymology: New Latin, from hexa- + methonium
: the bivalent substituted ammonium ion [(CH 3 ) 3 N(CH 2 ) 6 N(CH 3 ) 3 ] ++ derived by methylation of hexamethylenediamine ; also : any salt (as the chloride or bromide) containing this ion used as a ganglionic blocking agent in the treatment of hypertension