The Collaborative International Dictionary of English v.0.48:

Ring \Ring\, n. [AS. hring, hrinc; akin to Fries. hring, D. & G.
   ring, OHG. ring, hring, Icel. hringr, DAn. & SW. ring; cf.
   Russ. krug'. Cf. Harangue, Rank a row,Rink.]
   A circle, or a circular line, or anything in the form of a
   circular line or hoop.
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   2. Specifically, a circular ornament of gold or other
      precious material worn on the finger, or attached to the
      ear, the nose, or some other part of the person; as, a
      wedding ring.
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            Upon his thumb he had of gold a ring. --Chaucer.
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            The dearest ring in Venice will I give you. --Shak.
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   3. A circular area in which races are or run or other sports
      are performed; an arena.
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            Place me, O, place me in the dusty ring,
            Where youthful charioteers contend for glory. --E.
                                                  Smith.
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   4. An inclosed space in which pugilists fight; hence,
      figuratively, prize fighting. "The road was an
      institution, the ring was an institution." --Thackeray.
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   5. A circular group of persons.
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            And hears the Muses in a ring
            Aye round about Jove's alter sing.    --Milton.
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   6. (Geom.)
      (a) The plane figure included between the circumferences
          of two concentric circles.
      (b) The solid generated by the revolution of a circle, or
          other figure, about an exterior straight line (as an
          axis) lying in the same plane as the circle or other
          figure.
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   7. (Astron. & Navigation) An instrument, formerly used for
      taking the sun's altitude, consisting of a brass ring
      suspended by a swivel, with a hole at one side through
      which a solar ray entering indicated the altitude on the
      graduated inner surface opposite.
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   8. (Bot.) An elastic band partly or wholly encircling the
      spore cases of ferns. See Illust. of Sporangium.
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   9. A clique; an exclusive combination of persons for a
      selfish purpose, as to control the market, distribute
      offices, obtain contracts, etc.
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            The ruling ring at Constantinople.    --E. A.
                                                  Freeman.
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   Ring armor, armor composed of rings of metal. See Ring
      mail, below, and Chain mail, under Chain.

   Ring blackbird (Zool.), the ring ousel.

   Ring canal (Zool.), the circular water tube which surrounds
      the esophagus of echinoderms.

   Ring dotterel, or Ringed dotterel. (Zool.) See
      Dotterel, and Illust. of Pressiroster.

   Ring dropper, a sharper who pretends to have found a ring
      (dropped by himself), and tries to induce another to buy
      it as valuable, it being worthless.

   Ring fence. See under Fence.

   Ring finger, the third finger of the left hand, or the next
      the little finger, on which the ring is placed in
      marriage.

   Ring formula (Chem.), a graphic formula in the shape of a
      closed ring, as in the case of benzene, pyridine, etc. See
      Illust. under Benzene.

   Ring mail, a kind of mail made of small steel rings sewed
      upon a garment of leather or of cloth.

   Ring micrometer. (Astron.) See Circular micrometer, under
      Micrometer.

   Saturn's rings. See Saturn.

   Ring ousel. (Zool.) See Ousel.

   Ring parrot (Zool.), any one of several species of Old
      World parrakeets having a red ring around the neck,
      especially Palaeornis torquatus, common in India, and
      Palaeornis Alexandri of Java.

   Ring plover. (Zool.)
      (a) The ringed dotterel.
      (b) Any one of several small American plovers having a
          dark ring around the neck, as the semipalmated plover
          (Aegialitis semipalmata).

   Ring snake (Zool.), a small harmless American snake
      (Diadophis punctatus) having a white ring around the
      neck. The back is ash-colored, or sage green, the belly of
      an orange red.

   Ring stopper. (Naut.) See under Stopper.

   Ring thrush (Zool.), the ring ousel.

   The prize ring, the ring in which prize fighters contend;
      prize fighters, collectively.

   The ring.
      (a) The body of sporting men who bet on horse races.
          [Eng.]
      (b) The prize ring.
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WordNet (r) 3.0 (2006):

ring blackbird
    n 1: European thrush common in rocky areas; the male has
         blackish plumage with a white band around the neck [syn:
         ring ouzel, ring blackbird, ring thrush, Turdus
         torquatus]