Webster's English Dictionary

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predacious

pre.da.cious or pre.da.ceous \pri-'da--sh*s\ \-'das-*t-e-\ aj [L praedari 
   to prey upon (fr. praeda prey) + E -acious (as in] rapacious) - more at 
   PREY : living by preying on other animals : PREDATORY  - pre.da.cious.ness 
   n