methonium

noun
me·​tho·​ni·​um | \ mə-ˈthō-nē-əm \

Medical Definition of methonium

: any of several bivalent doubled substituted ammonium ions (as decamethonium or hexamethonium) in which the two quaternary nitrogen atoms are separated by a polymethylene chain methonium salts used in the treatment of hypertension

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