Source : Webster's Revised Unabridged Dictionary (1913)

Bloodthirsty \Blood"thirst`y\, a.
   Eager to shed blood; cruel; sanguinary; murderous. --
   {Blood"thirst`i*ness} (?), n.

Source : WordNet®

bloodthirsty
     adj : marked by eagerness to resort to violence and bloodshed;
           "bloody-minded tyrants"; "bloodthirsty yells"; "went
           after the collaborators with a sanguinary fury that
           drenched the land with blood"-G.W.Johnson [syn: {bloody-minded},
            {sanguinary}]
     [also: {bloodthirstiest}, {bloodthirstier}]