WordReference Random House Unabridged Dictionary of American English © 2026
hex•a•me•tho•ni•um
(hek′sə mə thō′nē əm),USA pronunciation n. [Pharm.]
- Drugsa compound, C10H24N2, 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.
- hexa- + meth(yl) + (amm)onium 1945–50