Source : Webster's Revised Unabridged Dictionary (1913)

Omnivorous \Om*niv"o*rous\, a. [L. omnivorus; omnis all + vorate
   to eat greedily. See {Voracious}.]
   All-devouring; eating everything indiscriminately; as,
   omnivorous vanity; esp. (Zo["o]l.), eating both animal and
   vegetable food. -- {Om*niv"o*rous*ness}, n.

Source : WordNet®

omnivorous
     adj : feeding on both plants and animals [ant: {insectivorous}, {carnivorous},
            {herbivorous}]