The Collaborative International Dictionary of English v.0.48:

Crown \Crown\ (kroun), n. [OE. corone, coroun, crune, croun, OF.
   corone, corune, F. couronne, fr. L. corona crown, wreath;
   akin to Gr. korw`nh anything curved, crown; cf. also L.
   curvus curved, E. curve, curb, Gael. cruinn round, W. crwn.
   Cf. Cornice, Corona, Coroner, Coronet.]
   1. A wreath or garland, or any ornamental fillet encircling
      the head, especially as a reward of victory or mark of
      honorable distinction; hence, anything given on account
      of, or obtained by, faithful or successful effort; a
      reward. "An olive branch and laurel crown." --Shak.
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            They do it to obtain a corruptible crown; but we an
            incorruptible.                        --1 Cor. ix.
                                                  25.
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            Be thou faithful unto death, and I will give thee a
            crown of life.                        --Rev. ii. 10.
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   2. A royal headdress or cap of sovereignty, worn by emperors,
      kings, princes, etc.
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   Note: Nobles wear coronets; the triple crown of the pope is
         usually called a tiara. The crown of England is a
         circle of gold with crosses, fleurs-de-lis, and
         imperial arches, inclosing a crimson velvet cap, and
         ornamented with thousands of diamonds and precious
         stones.
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   3. The person entitled to wear a regal or imperial crown; the
      sovereign; -- with the definite article.
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            Parliament may be dissolved by the demise of the
            crown.                                --Blackstone.
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            Large arrears of pay were due to the civil and
            military servants of the crown.       --Macaulay.
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   4. Imperial or regal power or dominion; sovereignty.
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            There is a power behind the crown greater than the
            crown itself.                         --Junius.
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   5. Anything which imparts beauty, splendor, honor, dignity,
      or finish.
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            The hoary head is a crown of glory, if it be found
            in the way of righteousness.          --Prov. xvi.
                                                  31.
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            A virtuous woman is a crown to her husband. --Prov.
                                                  xvi. 4.
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   6. Highest state; acme; consummation; perfection.
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            Mutual love, the crown of all our bliss. --Milton.
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   7. The topmost part of anything; the summit.
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            The steepy crown of the bare mountains. --Dryden.
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   8. The topmost part of the head (see Illust. of Bird.);
      that part of the head from which the hair descends toward
      the sides and back; also, the head or brain.
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            From toe to crown he'll fill our skin with pinches.
                                                  --Shak.
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            Twenty things which I set down:
            This done, I twenty more-had in my crown. --Bunyan.
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   9. The part of a hat above the brim.
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   10. (Anat.) The part of a tooth which projects above the gum;
       also, the top or grinding surface of a tooth.
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   11. (Arch.) The vertex or top of an arch; -- applied
       generally to about one third of the curve, but in a
       pointed arch to the apex only.
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   12. (Bot.) Same as Corona.
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   13. (Naut.)
       (a) That part of an anchor where the arms are joined to
           the shank.
       (b) The rounding, or rounded part, of the deck from a
           level line.
       (c) pl. The bights formed by the several turns of a
           cable. --Totten.
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   14. The upper range of facets in a rose diamond.
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   15. The dome of a furnace.
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   16. (Geom.) The area inclosed between two concentric
       perimeters.
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   17. (Eccl.) A round spot shaved clean on the top of the head,
       as a mark of the clerical state; the tonsure.
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   18. A size of writing paper. See under Paper.
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   19. A coin stamped with the image of a crown; hence,a
       denomination of money; as, the English crown, a silver
       coin of the value of five shillings sterling, or a little
       more than $1.20; the Danish or Norwegian crown, a money
       of account, etc., worth nearly twenty-seven cents.
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   20. An ornaments or decoration representing a crown; as, the
       paper is stamped with a crown.
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   Crown of aberration (Astron.), a spurious circle around the
      true circle of the sun.

   Crown antler (Zool.), the topmost branch or tine of an
      antler; also, an antler having a cuplike top, with tines
      springing from the rim.

   Crown bar, one of the bars which support the crown sheet of
      steam-boiler furnace.

   Crown glass. See under Glass.

   Crown imperial. (Bot.) See in the Vocabulary.

   Crown jewels, the jewels appertaining to the sovereign
      while wearing the crown. [Eng.] "She pawned and set to
      sale the crown jewels." --Milton.

   Crown land, land belonging to the crown, that is, to the
      sovereign.

   Crown law, the law which governs criminal prosecutions.
      [Eng.]

   Crown lawyer, one employed by the crown, as in criminal
      cases. [Eng.]

   Crown octavo. See under Paper.

   Crown office. See in the Vocabulary.

   Crown paper. See under Paper.

   Crown piece. See in the Vocabulary.

   Crown Prince, the heir apparent to a crown or throne.

   Crown saw. See in the Vocabulary.

   Crown scab (Far.), a cancerous sore formed round the
      corners of a horse's hoof.

   Crown sheet, the flat plate which forms the top of the
      furnace or fire box of an internally fired steam boiler.


   Crown shell. (Zool.) See Acorn-shell.

   Crown side. See Crown office.

   Crown tax (Eccl. Hist.), a golden crown, or its value,
      which was required annually from the Jews by the king of
      Syria, in the time of the Maccabees. --1 Macc. x. 20.

   Crown wheel. See in the Vocabulary.

   Crown work. See in the Vocabulary.

   Pleas of the crown (Engl. law), criminal actions.
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WordNet (r) 3.0 (2006):

crown imperial
    n 1: Eurasian herb with a cluster of leaves and orange-red bell-
         shaped flowers at the top of the stem [syn: crown
         imperial, Fritillaria imperialis]