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The definition of a quack is the sound a duck makes, or a person who claims to have a specific skilled that he does not have. An example of a quack is what you'll likely hear at a duck park. An example of a quack is a fake doctor. Quack is defined as to make the noise of a duck.
tract (trÄkt) n. An elongated assembly of tissue or organs having a common origin, function, and termination, or a serial arrangement having a common function. A bundle of nerve fibers having a common origin, termination, and function.