The Collaborative International Dictionary of English v.0.48:

Tongue \Tongue\, n. [OE. tunge, tonge, AS. tunge; akin to
   OFries. tunge, D. tong, OS. tunga, G. zunge, OHG. zunga,
   Icel. & Sw. tunga, Dan tunge, Goth. tugg[=o], OL. dingua, L.
   lingua. [root]243 Cf.Language, Lingo. ]
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   1. (Anat.) an organ situated in the floor of the mouth of
      most vertebrates and connected with the hyoid arch.
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   Note: The tongue is usually muscular, mobile, and free at one
         extremity, and in man other mammals is the principal
         organ of taste, aids in the prehension of food, in
         swallowing, and in modifying the voice as in speech.
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               To make his English sweet upon his tongue.
                                                  --Chaucer.
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   2. The power of articulate utterance; speech.
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            Parrots imitating human tongue.       --Dryden.
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   3. Discourse; fluency of speech or expression.
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            Much tongue and much judgment seldom go together.
                                                  --L. Estrange.
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   4. Honorable discourse; eulogy. [Obs.]
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            She was born noble; let that title find her a
            private grave, but neither tongue nor honor. --Beau.
                                                  & Fl.
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   5. A language; the whole sum of words used by a particular
      nation; as, the English tongue. --Chaucer.
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            Whose tongue thou shalt not understand. --Deut.
                                                  xxviii. 49.
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            To speak all tongues.                 --Milton.
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   6. Speech; words or declarations only; -- opposed to thoughts
      or actions.
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            My little children, let us love in word, neither in
            tongue, but in deed and in truth.     --1 John iii.
                                                  18.
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   7. A people having a distinct language.
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            A will gather all nations and tongues. --Isa. lxvi.
                                                  18.
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   8. (Zool.)
      (a) The lingual ribbon, or odontophore, of a mollusk.
      (b) The proboscis of a moth or a butterfly.
      (c) The lingua of an insect.
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   9. (Zool.) Any small sole.
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   10. That which is considered as resembing an animal's tongue,
       in position or form. Specifically:
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       (a) A projection, or slender appendage or fixture; as,
           the tongue of a buckle, or of a balance.
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       (b) A projection on the side, as of a board, which fits
           into a groove.
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       (c) A point, or long, narrow strip of land, projecting
           from the mainland into a sea or a lake.
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       (d) The pole of a vehicle; especially, the pole of an ox
           cart, to the end of which the oxen are yoked.
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       (e) The clapper of a bell.
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       (f) (Naut.) A short piece of rope spliced into the upper
           part of standing backstays, etc.; also. the upper
           main piece of a mast composed of several pieces.
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       (g) (Mus.) Same as Reed, n., 5.
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   To hold the tongue, to be silent.

   Tongue bone (Anat.), the hyoid bone.

   Tongue grafting. See under Grafting.
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   Syn: Language; speech; expression. See Language.
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