“+ noun
Etymology: International Scientific Vocabulary hexamethylene + tetramine
: a crystalline tricyclic weak base (CH 2 ) 6 N 4 made by the action of ammonia on formaldehyde and used chiefly as a source of formaldehyde (as in the manufacture of phenolic resins), as a vulcanization accelerator, and in medicine as a urinary antiseptic — called also hexamine, methenamine