Noun orb has 2 senses
  1. eyeball, orb - the ball-shaped capsule containing the vertebrate eye
    --1 is a kind of capsule
    --1 is a part of eye, oculus, optic
  2. ball, globe, orb - an object with a spherical shape; "a ball of fire"
    --2 is a kind of sphere
    --2 has particulars:
     crystal ball; mothball, camphor ball; time-ball; fireball; fireball; globule; spherule; pellet; bolus
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