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  • quack

    Pertaining to or characterised by, boasting and pretension; used by quacks; pretending to cure diseases; as, a quack medicine; a quack doctor.

  • quadricycle

    A four wheeled pedal or lever operated light railway vehicle used by track maintenance staff.

  • quarantine

    A period of isolation that is forced on people to try to halt the spread of disease. Quarantine was one of the few measures available to combat the spread of infectious disease before the development of antibiotics.

  • quinine

    A substance taken to fight malaria. Quinine is found naturally in the bark of the cinchona tree. It is also an ingredient in tonic water.