The Collaborative International Dictionary of English v.0.48:

Carnivorous \Car*niv"o*rous\, a. [L. carnivorus; caro, carnis,
   flesh + varare to devour.]
   Eating or feeding on flesh. The term is applied:
   (a) to animals which naturally seek flesh for food, as the
       tiger, dog, etc.;
   (b) to plants which are supposed to absorb animal food;
   (c) to substances which destroy animal tissue, as caustics.
       [1913 Webster] Carnose

WordNet (r) 3.0 (2006):

carnivorous
    adj 1: relating to or characteristic of carnivores; "the lion
           and other carnivorous animals"
    2: (used of plants as well as animals) feeding on animals;
       "carnivorous plants are capable of trapping and digesting
       small animals especially insects" [ant: herbivorous,
       insectivorous, omnivorous]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "carnivorous":
   cannibal, cannibalistic, commensal, dietetic, dining, eating,
   feeding, flesh-eating, fruitarian, gastronomic, gluttonous,
   grain-eating, graminivorous, granivorous, grass-eating,
   herbivorous, insect-eating, insectivorous, lactovegetarian,
   man-eating, meat-eating, mensal, nourishing, nutritious,
   omnivorous, omophagous, pantophagous, phytivorous, phytophagous,
   plant-eating, postprandial, prandial, predacious, preprandial,
   vegetable-eating, vegetarian



The Devil's Dictionary (1881-1906):

CARNIVOROUS, adj.  Addicted to the cruelty of devouring the timorous
vegetarian, his heirs and assigns.