An ungraduated ignorant pretender to skill in physic, a vender of nostrums.
·vi To utter a sound like the cry of a duck. II. Quack ·vi To act the part of a quack, or pretender...
Webster's Dictionary of the English Language
·- ·see Quitch grass. ...
A mountebank: a seller of salves. ...
Dictionary of The Vulgar Tongue by Francis Grose