(DISHONEST PERSON) [noun] [C] [disapproving] - a person who dishonestly pretends to have medical skills or knowledgeHe went to see a quack who said he could cure him with some kind of strange herbs.I can't believe that quack treatment will work.(UK and ANZ informal) A quack is also a doctor.Have you seen your quack about that cough?
QUACK
Meaning of QUACK in English
Cambridge English vocab. Кембриджский английский словарь. 2012