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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.
A quark (/ËkwÉrk/ or /ËkwÉrk/) is an elementary particle and a fundamental constituent of matter. Quarks combine to form composite particles called hadrons, the most stable of which are protons and neutrons, the components of atomic nuclei.t the time of the quark theory's inception, the  particle zoo  included, amongst other particles, a multitude of hadrons. Gell-Mann and Zweig posited that they were not elementary particles, but were instead composed of combinations of quarks and antiquarks.