Webster's English Dictionary

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orb

1. orb \'o.(*)rb\ n [MF orbe, fr. L orbis circle, disk, orb; akin to L 
   orbita tra]ck, rut 1: any of the concentric spheres in old astronomy 
   surrounding the earth and  carrying the heavenly bodies in their 
   revolutions archaic  2: something circular : CIRCLE, ORBIT  3: a spherical 
   body; esp : a celestial sphere  4: EYE  5: a sphere surmounted by a cross 
   symbolizing kingly power and justice 
2. orb vt 1: to form into a disk or circle  archaic  2: ENCIRCLE, SURROUND, 
   ENCLOSE  archaic  : to move in an orbit