Definitions for "quack"
To make vain and loud pretensions; to boast.
To act the part of a quack, or pretender.
A boastful pretender to medical skill; an empiric; an ignorant practitioner.
To utter a sound like the cry of a duck.
The cry of the duck, or a sound in imitation of it; a hoarse, quacking noise.
the harsh sound of a duck
Quack is a daemon-mode gnutella server. It allows file indexing so that searches do not depend solely on the filename, as is required by other gnutella servers.
a Queen or Jack