quack (v.) Copy link Outline I. As a duckII. To make loud and boastful pretensions, esp. in medicine ("To quack of universal cures"III. To practise medicine as a quack • quack (v.): I. As a duck: (?) tĕtrinnĭo, 4: Auct. Carm. de Philomath. 22. II. To make loud and boastful pretensions, esp. in medicine ("To quack of universal cures": Hudibras): se jactare: gloriari: v. to boast; to brag. III. To practise medicine as a quack: perh. *medicinam circulatoriam facere, v. quackery: empiricen facere (cf. Plin. 29, 1, 4: alia factio--ab experimentis cognominant empiricen): cf. Cels. l. inf. cit. s. v. quack (subs.).