/hek'seuh meuh thoh"nee euhm/ , n. Pharm.
a compound, C 10 H 24 N 2 , used in the treatment of severe hypertension to lower blood pressure and increase blood flow by blocking transmission of nerve impulses that constrict blood vessels.
[ 1945-50; HEXA- + METH(YL) + (AMM)ONIUM ]