a white, crystalline derivative of amphetamine, CHN, used in the form of its hydrochloride as a drug that is more stimulating than amphetamine
See methamphetamine in American Heritage Dictionary 4
(mĕthˌăm-fĕtˈə-mēnˌ, -mĭn)
noun
An amine derivative of amphetamine, C10H15N, used in the form of its crystalline hydrochloride as a central nervous system stimulant, both medically and illicitly.