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1. A sphere or spherical object.
a. A celestial body, such as the sun or moon.
b. Archaic The earth.
3. One of a series of concentric transparent spheres thought by ancient and medieval astronomers to rotate about the earth and carry the celestial bodies.
4. A globe surmounted by a cross, used as a symbol of monarchial power and justice.
5. An eye or eyeball.
6. Archaic Something of circular form; a circle or orbit.
v. orbed, orb·ing, orbs
1. To shape into a circle or sphere.
2. Archaic To encircle; enclose.
v.intr. Archaic
To move in an orbit.

[Middle English orbe, orbit, from Old French, from Latin orbis, circle, disk, orbit; see orbh- in Indo-European roots.]