cannibalism

from WordNet (r) 3.0 (2006)

cannibalism
    n 1: the practice of eating the flesh of your own kind

from The Collaborative International Dictionary of English v.0.48

Cannibalism \Can"ni*bal*ism\, n. [Cf. F. cannibalisme.]
   The act or practice of eating human flesh by mankind. Hence;
   Murderous cruelty; barbarity. --Berke.
   [1913 Webster]