The Collaborative International Dictionary of English v.0.48:

Mutton \Mut"ton\, n. [OE. motoun, OF. moton, molton, a sheep,
   wether, F. mouton, LL. multo, by transposition of l fr. L.
   mutilus mutilated. See Mutilate.]
   1. A sheep. [Obs.] --Chapman.
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            Not so much ground as will feed a mutton. --Sir H.
                                                  Sidney.
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            Muttons, beeves, and porkers are good old words for
            the living quadrupeds.                --Hallam.
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   2. The flesh of a sheep.
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            The fat of roasted mutton or beef.    --Swift.
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   3. A loose woman; a prostitute. [Obs.]
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   Mutton bird (Zool.), the Australian short-tailed petrel
      (Nectris brevicaudus).

   Mutton chop, a rib of mutton for broiling, with the end of
      the bone at the smaller part chopped off.

   Mutton fish (Zool.), the American eelpout. See Eelpout.


   Mutton fist, a big brawny fist or hand. [Colloq.] --Dryden.

   Mutton monger, a pimp. [Low & Obs.] --Chapman.

   To return to one's muttons. [A translation of a phrase from
      a farce by De Brueys, revenons [`a] nos moutons let us
      return to our sheep.] To return to one's topic, subject of
      discussion, etc. [Humorous]
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            I willingly return to my muttons.     --H. R.
                                                  Haweis.
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The Collaborative International Dictionary of English v.0.48:

Eelpout \Eel"pout`\, n. [AS. ?lepute.] (Zo["o]l.)
   (a) A European fish (Zoarces viviparus), remarkable for
       producing living young; -- called also greenbone,
       guffer, bard, and Maroona eel. Also, an American
       species (Z. anguillaris), -- called also mutton fish,
       and, erroneously, congo eel, ling, and lamper eel.
       Both are edible, but of little value.
   (b) A fresh-water fish, the burbot.
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