The Collaborative International Dictionary of English v.0.48:

Orb \Orb\ ([^o]rb), n. [OF. orb blind, fr. L. orbus destitute.]
   (Arch.)
   A blank window or panel. [Obs.] --Oxf. Gloss.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Orb \Orb\, n. [F. orbe, fr. L. orbis circle, orb. Cf. Orbit.]
   [1913 Webster]
   1. A spherical body; a globe; especially, one of the
      celestial spheres; a sun, planet, or star.
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            In the small orb of one particular tear. --Shak.
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            Whether the prime orb,
            Incredible how swift, had thither rolled. --Milton.
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   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.
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   3. A circle; esp., a circle, or nearly circular orbit,
      described by the revolution of a heavenly body; an orbit.
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            The schoolmen were like astronomers, which did feign
            eccentrics, and epicycles, and such engines of orbs.
                                                  --Bacon.
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            You seem to me as Dian in her orb.    --Shak.
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            In orbs
            Of circuit inexpressible they stood,
            Orb within orb.                       --Milton.
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   4. A period of time marked off by the revolution of a
      heavenly body. [R.] --Milton.
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   5. The eye, as luminous and spherical. [Poetic]
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            A drop serene hath quenched their orbs. --Milton.
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   6. A revolving circular body; a wheel. [Poetic]
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            The orbs
            Of his fierce chariot rolled.         --Milton.
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   7. A sphere of action or influence. --Wordsworth.
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            But in our orbs we'll live so round and safe. --Shak
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   8. Same as Mound, a ball or globe. See 1st Mound.
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   9. (Mil.) A body of soldiers drawn up in a circle, as for
      defense, esp. infantry to repel cavalry.
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   Syn: Globe; ball; sphere. See Globe.
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The Collaborative International Dictionary of English v.0.48:

Orb \Orb\ ([^o]rb), v. t. [imp. & p. p. Orbed ([^o]rbd); p.
   pr. & vb. n. Orbing.]
   1. To form into an orb or circle. [Poetic] --Milton.
      --Lowell.
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   2. To encircle; to surround; to inclose. [Poetic]
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            The wheels were orbed with gold.      --Addison.
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The Collaborative International Dictionary of English v.0.48:

Orb \Orb\, v. i.
   To become round like an orb. [Poetic]
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         And orb into the perfect star.           --Tennyson.
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WordNet (r) 3.0 (2006):

orb
    n 1: the ball-shaped capsule containing the vertebrate eye [syn:
         eyeball, orb]
    2: an object with a spherical shape; "a ball of fire" [syn:
       ball, globe, orb]
    v 1: move in an orbit; "The moon orbits around the Earth"; "The
         planets are orbiting the sun"; "electrons orbit the
         nucleus" [syn: orb, orbit, revolve]

Moby Thesaurus II by Grady Ward, 1.0:

133 Moby Thesaurus words for "orb":
   Aldebaran, Canicula, Dog Star, Hesper, Hesperus, Lucifer,
   North Star, Phosphor, Phosphorus, Polaris, Sirius, Venus, Vesper,
   ambit, area, arena, baby blues, bailiwick, ball, balloon,
   banjo eyes, beat, bladder, blob, boll, bolus, border, borderland,
   bright eyes, bubble, bulb, bulbil, bulblet, cap of dignity,
   cap of maintenance, celestial body, circle, circuit, clear eyes,
   comet, cornea, coronet, crown, daystar, demesne, department,
   diadem, discipline, domain, dominion, ellipsoid, ermine,
   evening star, eye, eyeball, eyelid, field, fixed stars, geoid,
   globe, globelet, globoid, globule, glomerulus, gob, gobbet,
   goggle eyes, great seal, heavenly body, hemisphere, iris,
   judicial circuit, jurisdiction, knob, knot, lamp, lens, lid,
   living sapphires, lodestar, march, morning star, naked eye,
   nictitating membrane, oblate spheroid, ocular, oculus, optic,
   optic nerve, orbit, orblet, organ of vision, pale, peeper, pellet,
   polar star, polestar, popeyes, precinct, privy seal,
   prolate spheroid, province, pupil, purple, purple pall, realm,
   regalia, retina, robe of state, rod, rod of empire, rondure, round,
   royal crown, saucer eyes, scepter, sclera, seal, signet, sphere,
   spheroid, spherule, starry host, starry orbs, stars, subdiscipline,
   tiara, triple plume, unaided eye, uraeus, visual organ, walk,
   winker



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ORB
       Object Request Broker (OMA, OMG, CORBA, ORB)


The Free On-line Dictionary of Computing (30 December 2018):

Object Request Broker
ORB

    (ORB) Part of the OMG CORBA specification,
   an ORB's basic function is to pass method invocation
   requests to the correct objects and return the results to
   the caller.

   To achieve this the ORB must be able must be able to identify
   and locate objects, handle connections from invoker and the
   data returned from methods.  Communication between the ORB and
   applications are achieved through IDL stubs and skeletons
   whilst the OMG has specified IIOP as the protocol through
   which ORBs may communicate with each other.  Using IIOP, an
   ORB may request method invocations from a remote object.

   (2003-11-21)