The Collaborative International Dictionary of English v.0.48:

Crust \Crust\ (kr?st), n. [L. crusta: cf. OF. crouste, F.
   cro[^u]te; prob. akin to Gr. ????? ice, E. crystal, from the
   same root as E. crude, raw. See Raw, and cf. Custard.]
   1. The hard external coat or covering of anything; the hard
      exterior surface or outer shell; an incrustation; as, a
      crust of snow.
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            I have known the statute of an emperor quite hid
            under a crust of dross.               --Addison.
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            Below this icy crust of conformity, the waters of
            infidelity lay dark and deep as ever. --Prescott.
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   2. (Cookery)
      (a) The hard exterior or surface of bread, in distinction
          from the soft part or crumb; or a piece of bread grown
          dry or hard.
      (b) The cover or case of a pie, in distinction from the
          soft contents.
      (c) The dough, or mass of doughy paste, cooked with a
          potpie; -- also called dumpling.
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                Th' impenetrable crust thy teeth defies.
                                                  --Dryden.
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                He that keeps nor crust nor crumb. --Shak.
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                They . . . made the crust for the venison pasty.
                                                  --Macaulay.
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   3. (Geol.) The exterior portion of the earth, formerly
      universally supposed to inclose a molten interior.
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   4. (Zool.) The shell of crabs, lobsters, etc.
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   5. (Med.) A hard mass, made up of dried secretions blood, or
      pus, occurring upon the surface of the body.
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   6. An incrustation on the interior of wine bottles, the
      result of the ripening of the wine; a deposit of tartar,
      etc. See Beeswing.
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The Collaborative International Dictionary of English v.0.48:

Dumpling \Dump"ling\, n. [Dimin. of dump an illshapen piece; cf.
   D. dompelen to plunge, dip, duck, Scot. to dump in to plunge
   into, and E. dump, v. t.]
   A roundish mass of dough boiled in soup, or as a sort of
   pudding; often, a cover of paste inclosing an apple or other
   fruit, and boiled or baked; as, an apple dumpling.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dumpling
    n 1: small balls or strips of boiled or steamed dough [syn:
         dumpling, dumplings]
    2: dessert made by baking fruit wrapped in pastry

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "dumpling":
   Italian paste, blimp, fedellini, fettuccine, knaydlach, lasagne,
   macaroni, matzo balls, noodles, pasta, paste, ravioli, spaetzle,
   spaghetti, spaghettini, vermicelli, won ton, ziti