Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

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