1. A spherical body; a globe; especially, one of the celestial spheres;
a sun, planet, or star.
In the small orb of one particular tear.
Shak.
Whether the prime orb, Incredible how swift, had thither rolled.
Milton.
2. One of the azure transparent spheres conceived by the ancients to be
inclosed one within another, and to carry the heavenly bodies in their
revolutions.
3. A circle; esp., a circle, or nearly circular orbit, described by the
revolution of a heavenly body; an orbit.
The schoolmen were like astronomers, which did feign eccentrics,
and epicycles, and such engines of orbs.
Bacon.
You seem to me as Dian in her orb.
Shak.
In orbs Of circuit inexpressible they stood, Orb within orb.
Milton.
4. A period of time marked off by the revolution of a heavenly body.
[R.] Milton.