aine, mis organismi sisestatuna võib modifitseerida selle funktsioone (medikamendid, psühhotroopsed ained jms) või tekitada tugevat sõltuvust (narkootikumid)
Any substance which when absorbed into a living organism may modify one or more of its functions. The term is generally accepted for a substance taken for a therapeutic purpose, but is also commonly used for abused substances (medicine, pharmaceutical).
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