drug /drəɡ/ a medicine or other substance which has a physiological effect when ingested or otherwise introduced into the body. al·co·hol ˈalkəˌhôl,ˈalkəˌhäl/ noun a colorless volatile flammable liquid that is the intoxicating constituent of wine, beer, spirits, and other drinks, and is also used as an industrial solvent and as fuel. lets not forget Brotherly bonds, blonde best friends and hot teachers.