drug (n):countable] • 1. an illegal substance such as marijuana or cocaine, which some people take in order to feel happy, relaxed, or excited -A lot of young people start taking drugs at school. -One third of America's thirteen-year-olds use drugs. -I don't drink, and I don't do drugs. -She always looks as though she's on drugs. -All the band experimented with drugs, particularly LSD. -Parents should talk openly to their children about the dangers of drug abuse. -Jimi Hendrix died of a drug overdose.
drug (n):countable • 2- a medicine, or a substance for making medicines -a drug used in the treatment of cancer drug for -new drugs for AIDS-related conditions -Drugs prescribed (=ordered for people) by doctors can be extremely hazardous if used in the wrong way. -The big drug companies make huge profits.
drug (n):countable] • 3. a substance that people doing a sport sometimes take illegally to improve their performance -She was banned from the Olympics after failing a drug test (=a test that shows if you have taken drugs). • performance-enhancing drugs alcohol/drug abuse (=the practice of drinking too much or taking illegal drugs) lifesaving surgery/treatment/drugs etc
drug (n): countable] • hard drugs[plural]very strong illegal drugs such as heroin and cocaine • soft drug [countable] an illegal drug such marijuana that is not considered to be very harmful • drug addict[countable]: someone who cannot stop taking illegal drugs