The Collaborative International Dictionary of English v.0.48:
Bloodthirsty \Blood"thirst`y\, a. Eager to shed blood; cruel; sanguinary; murderous; having a bloodlust. -- Blood"thirst`i*ness (?), n. [1913 Webster]WordNet (r) 3.0 (2006):
bloodthirstiness n 1: a disposition to shed blood [syn: bloodiness, bloodthirstiness]