omnivorous Syllabification: (om·niv·o·rous)Pronunciation: /ämˈniv(ə)rəs/Translate omnivorous | into Spanish Definition of omnivorous adjective (of an animal or person) feeding on food of both plant and animal origin. taking in or using whatever is available:an omnivorous readerDerivatives omnivorously adverb omnivorousness noun Origin: mid 17th century: from Latin omnivorus + -ousomnivorous in other Oxford dictionaries Definition of omnivorous in the British & World English dictionary