What is the difference between a comet, an asteroid, and a meteor?

what is the difference between a comet, an asteroid, and a meteor?

COMET: a celestial body that appears as a fuzzy head usually surrounding a bright nucleus, that has a usually highly eccentric orbit, that consists primarily of ice and dust, and that often develops one or more long tails when near the sun

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ASTEROID: any of the small rocky celestial bodies found especially between the orbits of Mars and Jupiter

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METEOR: any of the small particles of matter in the solar system that are directly observable only by their incandescence from frictional heating on entry into the atmosphere

.. and I dare add

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METEORITE: a meteor that enters our atmosphere and lands on earth