The Collaborative International Dictionary of English v.0.48:

Raven \Rav"en\, v. i.
   To prey with rapacity; to be greedy; to show rapacity.
   [Written also ravin, and ravine.]
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         Benjamin shall raven as a wolf.          --Gen. xlix.
                                                  27.
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The Collaborative International Dictionary of English v.0.48:

Raven \Ra"ven\ (r[=a]"v'n), n. [AS. hr[ae]fn; akin to D. raaf,
   G. rabe, OHG. hraban, Icel. hrafn, Dan. ravn, and perhaps to
   L. corvus, Gr. ko`rax. [root]19.] (Zool.)
   A large black passerine bird (Corvus corax), similar to the
   crow, but larger, and has a harsh, loud call. It is native of
   the northern parts of Europe, Asia and America, and is noted
   for its sagacity.
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   Sea raven (Zool.), the cormorant.
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The Collaborative International Dictionary of English v.0.48:

Raven \Ra"ven\, a.
   Of the color of the raven; jet black; as, raven curls; raven
   darkness.
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The Collaborative International Dictionary of English v.0.48:

Raven \Rav"en\ (r[a^]v"'n), n. [OF. ravine impetuosity,
   violence, F. ravine ravine. See Ravine, Rapine.] [Written
   also ravin, and ravine.]
   1. Rapine; rapacity. --Ray.
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   2. Prey; plunder; food obtained by violence.
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The Collaborative International Dictionary of English v.0.48:

Raven \Rav"en\, v. t. [imp. & p. p. Ravened (r[a^]v"'nd); p.
   pr. & vb. n. Ravening.] [Written also ravin, and ravine.]
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   1. To obtain or seize by violence. --Hakewill.
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   2. To devour with great eagerness.
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            Like rats that ravin down their proper bane. --Shak.
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WordNet (r) 3.0 (2006):

raven
    n 1: large black bird with a straight bill and long wedge-shaped
         tail [syn: raven, Corvus corax]
    v 1: obtain or seize by violence
    2: prey on or hunt for; "These mammals predate certain eggs"
       [syn: raven, prey, predate]
    3: eat greedily; "he devoured three sandwiches" [syn: devour,
       guttle, raven, pig]
    4: feed greedily; "The lions ravened the bodies"