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Definition of methenamine in US English:

methenamine

noun

  • 1Chiefly Pharmacology. The compound hexamethylenetetramine, (CH₂)₆N₄, or a derivative of this (often with mandelic acid), especially when used as a urinary antiseptic.

  • 2Pathology. In full "methenamine silver". A solution of methenamine and silver nitrate, used in several histological stains.

Origin

1920s; earliest use found in Pharmacopeia United States. From methene + amine.