WordReference Random House Unabridged Dictionary of American English © 2026
meth•y•ser•gide
(meth′ə sûr′jīd),USA pronunciation n. [Pharm.]
- Drugsan ergot alkaloid derivative, C21H27N3O2, used in the prophylaxis and treatment of migraine and cluster headaches.
- meth- + (l)yserg(ic) (see lysergic acid) + -ide 1960–65