From The Collaborative International Dictionary of English v.0.48:

Orbit \Or"bit\, n. [L. orbita a track or rut made by a wheel,
   course, circuit, fr. orbis a circle: cf. F. orbite. See 2d
   1. (Astron.) The path described by a heavenly body in its
      periodical revolution around another body; as, the orbit
      of Jupiter, of the earth, of the moon.
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   2. An orb or ball. [Rare & Improper]
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            Roll the lucid orbit of an eye.       --Young.
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   3. (Anat.) The cavity or socket of the skull in which the eye
      and its appendages are situated.
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   4. (Zool.) The skin which surrounds the eye of a bird.
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