Wiktionary
n. (context slang English) A drug used illegally and recreationally for its euphoric and other mind-altering effects such as: opiates, cannabinoids, benzodiazepines, amphetamines and others.
WordNet
n. a drug that is taken for nonmedicinal reasons (usually for mind-altering effects); drug abuse can lead to physical and mental damage and (with some substances) dependence and addiction [syn: drug of abuse]
Usage examples of "street drug".
And the Center Street Drug, where Eddie got his refills, was three miles away, almost.
We're having a real problem with a new street drug called crazy-fog.
Judging by the dark residue and the lingering scent of exotic spices, he had done himself in with a common street drug known as Chartreuse.
That made him think pro, and pro made him think organized crime, not street drug dealer.
Semen stains and street drug residues jumped out like solar flares, and best of all, the light could pick up fingerprints that never would have been seen-in the past.