An orb is a ball-shaped object. You might be inspired to write a poem about the full moon in which you describe it as "a glowing orb."

The sun, moon, marbles, grapes — all of these have been described (particularly by poets) as orbs. Your round gold earrings, your dog's favorite tennis ball, and a grapefruit before you cut it in half can be called orbs too, because they're all spherical in shape. The Latin source, orbem, means "circle, disk, ring, or hoop," and is probably related to orbita, "wheel track or rut."

Definitions of orb
  1. noun
    an object with a spherical shape
    synonyms: ball, globe
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    crystal ball
    a glass or crystal globe used in crystal gazing by fortunetellers
    camphor ball, mothball
    a small sphere of camphor or naphthalene used to keep moths away from stored clothing
    a ball that slides down a staff to show a fixed time; especially at an observatory
    the luminous center of a nuclear explosion
    a ball of fire (such as the sun or a ball-shaped discharge of lightning)
    a small globe or ball
    a small sphere
    a small sphere
    a small round soft mass (as of chewed food)
    a hollow globule of gas (e.g., air or carbon dioxide)
    type of:
    a solid figure bounded by a spherical surface (including the space it encloses)
  2. noun
    the ball-shaped capsule containing the vertebrate eye
    synonyms: eyeball
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    type of:
    a structure that encloses a body part
  3. verb
    move in an orbit
    synonyms: orbit, revolve
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    move backward in an orbit, of celestial bodies
    type of:
    circle, circulate
    move in circles
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