QUACK Copy link • QUACK 1. v. To cry as a duck, tetrinnire (Auct. Carm. ad Phil.). To brag, se jactare; insolenter gloriari; gloriosius de se praedicare. [Vid: also, BRAG.] To practice medicine as a quack, *pharmacopolarum more medicinam exercere; *pharmacopolae negotium exercere. To take quack medicine, *pharmacopolam morbo adhibere; *malis medicamentis uti. 2. s. Irregular medical practitioner, pharmacopola circumforaneus; empiricus (sc. medicus, deriving his knowledge from practice only); medicus artis suae parum peritus. An empty boaster, jactator; ostentator; homo vaniloquus; homo vanus or gloriosus. Vid: BRAGGART.