(organic chemistry, proper) The racemic freebase of 1-phenylpropan-2-amine; an equal parts mixture of levoamphetamine and dextroamphetamine in their pure amine forms.

(informal) Any mixture of the two amphetamine enantiomers, dextroamphetamine and levoamphetamine.

(informal, nonstandard) Referring to a substituted amphetamine; a member of the amphetamine class of chemicals.

(medicine, pharmacology) A potent central nervous system stimulant of the phenethylamine chemical class that is used to treat ADHD, narcolepsy, and obesity.