an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
"The doctor warned that abusing meth, the crystalline hydrochloride form of the amphetamine derivative, could severely damage both the nervous system and metabolism."
Methamphetamine, especially in the form of the crystalline hydrochloride.
"The slang term meth was mistakenly used in that text to refer to marijuana, even though it actually denotes a different illicit drug."
Methadone.
A tramp.
A spiced mead, originally from Wales.
Marijuana.
In plain English: Meth is an illegal and highly addictive drug made from chemicals that can severely damage your brain and body if you use it.
"The police arrested him for selling meth on the corner last night."
Usage: Meth primarily refers to the illicit drug methamphetamine; while a historical term exists for a type of spiced mead, this usage is now archaic and rarely encountered outside of specific literary or etymological contexts. Avoid using "meth" as a casual synonym for other drugs unless referring specifically to methamphetamine.
Clipping of methamphetamine.