ETYM French charlatan, from Italian ciarlatano, from ciarlare to chartter, prate; of imitative origin; cf. Italian zirlare to whistle like a thrush.
One who makes false claims, especially regarding his own skills; a quack; an impostor.
Impostor; quack.

1. The harsh cry of a duck.
2. Any sound resembling the cry of a duck.
3. An untrained person who pretends to be a physician and who dispenses medical advice.