noun. ['ˈkwæk'] an untrained person who pretends to be a physician and who dispenses medical advice.
noun. child's word for a duck.
adjective. ['ˈkwæk'] medically unqualified.
verb. ['ˈkwæk'] utter quacking noises.
noun. ['ˈkwæk'] the harsh sound of a duck.
verb. ['ˈkwæk'] act as a medical quack or a charlatan.