The Collaborative International Dictionary of English v.0.48:

Cormorant \Cor"mo*rant\ (k[^o]r"m[-o]*rant), n. [F. cormoran,
   fr. Armor. m[=o]r-vran a sea raven; m[=o]r sea + bran raven,
   with cor, equiv. to L. corvus raven, pleonastically prefixed;
   or perh. fr. L. corvus marinus sea raven.]
   1. (Zool.) Any species of Phalacrocorax, a genus of sea
      birds having a sac under the beak; the shag. Cormorants
      devour fish voraciously, and have become the emblem of
      gluttony. They are generally black, and hence are called
      sea ravens, and coalgeese. [Written also corvorant.]
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   2. A voracious eater; a glutton, or gluttonous servant. --B.
      Jonson.
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