The Collaborative International Dictionary of English v.0.48:

Eat \Eat\ ([=e]t), v. t. [imp. Ate ([=a]t; 277), Obsolescent &
   Colloq. Eat ([e^]t); p. p. Eaten ([=e]t"'n), Obs. or
   Colloq. Eat ([e^]t); p. pr. & vb. n. Eating.] [OE. eten,
   AS. etan; akin to OS. etan, OFries. eta, D. eten, OHG. ezzan,
   G. essen, Icel. eta, Sw. [aum]ta, Dan. [ae]de, Goth. itan,
   Ir. & Gael. ith, W. ysu, L. edere, Gr. 'e`dein, Skr. ad.
   [root]6. Cf. Etch, Fret to rub, Edible.]
   1. To chew and swallow as food; to devour; -- said especially
      of food not liquid; as, to eat bread. "To eat grass as
      oxen." --Dan. iv. 25.
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            They . . . ate the sacrifices of the dead. --Ps.
                                                  cvi. 28.
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            The lean . . . did eat up the first seven fat kine.
                                                  --Gen. xli.
                                                  20.
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            The lion had not eaten the carcass.   --1 Kings
                                                  xiii. 28.
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            With stories told of many a feat,
            How fairy Mab the junkets eat.        --Milton.
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            The island princes overbold
            Have eat our substance.               --Tennyson.
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            His wretched estate is eaten up with mortgages.
                                                  --Thackeray.
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   2. To corrode, as metal, by rust; to consume the flesh, as a
      cancer; to waste or wear away; to destroy gradually; to
      cause to disappear.
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   To eat humble pie. See under Humble.

   To eat of (partitive use). "Eat of the bread that can not
      waste." --Keble.

   To eat one's words, to retract what one has said. (See the
      Citation under Blurt.)

   To eat out, to consume completely. "Eat out the heart and
      comfort of it." --Tillotson.

   To eat the wind out of a vessel (Naut.), to gain slowly to
      windward of her.

   Syn: To consume; devour; gnaw; corrode.
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The Collaborative International Dictionary of English v.0.48:

eaten \eaten\ adj.
   ingested through the mouth. Contrasted with uneaten.
   [Narrower terms: consumed; devoured, eaten up(predicate)]
   [WordNet 1.5 +PJC]