Source : Webster's Revised Unabridged Dictionary (1913)

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}. ]
   1. (Anat.) an organ situated in the floor of the mouth of
      most vertebrates and connected with the hyoid arch.

   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.

               To make his English sweet upon his tongue.
                                                  --Chaucer.

   2. The power of articulate utterance; speech.

            Parrots imitating human tongue.       --Dryden.

   3. Discourse; fluency of speech or expression.

            Much tongue and much judgment seldom go together.
                                                  --L. Estrange.

   4. Honorable discourse; eulogy. [Obs.]

            She was born noble; let that title find her a
            private grave, but neither tongue nor honor. --Beau.
                                                  & Fl.

   5. A language; the whole sum of words used by a particular
      nation; as, the English tongue. --Chaucer.

            Whose tongue thou shalt not understand. --Deut.
                                                  xxviii. 49.

            To speak all tongues.                 --Milton.

   6. Speech; words or declarations only; -- opposed to thoughts
      or actions.

            My little children, let us love in word, neither in
            tongue, but in deed and in truth.     --1 John iii.
                                                  18.

   7. A people having a distinct language.

            A will gather all nations and tongues. --Isa. lxvi.
                                                  18.

   8. (Zo["o]l.)
      (a) The lingual ribbon, or odontophore, of a mollusk.
      (b) The proboscis of a moth or a butterfly.
      (c) The lingua of an insect.

   9. (Zo["o]l.) Any small sole.

   10. That which is considered as resembing an animal's tongue,
       in position or form. Specifically:
       (a) A projection, or slender appendage or fixture; as,
           the tongue of a buckle, or of a balance.

Tongue \Tongue\, v. i.
   1. To talk; to prate. --Dryden.

   2. (Mus.) To use the tongue in forming the notes, as in
      playing the flute and some other wind instruments.

Tongue \Tongue\, v. t. [imp. & p. p. {Tongued}; p. pr. & vb. n.
   {Tonguing}.]
   1. To speak; to utter. ``Such stuff as madmen tongue.''
      --Shak.

   2. To chide; to scold.

            How might she tongue me.              --Shak.

   3. (Mus.) To modulate or modify with the tongue, as notes, in
      playing the flute and some other wind instruments.

   4. To join means of a tongue and grove; as, to tongue boards
      together.

Source : WordNet®

tongue
     v 1: articulate by tonguing, as when playing wind instruments
     2: lick or explore with the tongue

tongue
     n 1: a mobile mass of muscular tissue covered with mucous
          membrane and located in the oral cavity [syn: {lingua},
          {glossa}, {clapper}]
     2: a human written or spoken language used by a community;
        opposed to e.g. a computer language [syn: {natural
        language}] [ant: {artificial language}]
     3: any long thin projection that is transient; "tongues of
        flame licked at the walls"; "rifles exploded quick knives
        of fire into the dark" [syn: {knife}]
     4: a manner of speaking; "he spoke with a thick tongue"; "she
        has a glib tongue"
     5: a narrow strip of land that juts out into the sea [syn: {spit}]
     6: the tongue of certain animals used as meat
     7: the flap of material under the laces of a shoe or boot
     8: metal striker that hangs inside a bell and makes a sound by
        hitting the side [syn: {clapper}]