ferrous Syllabification: (fer·rous)Pronunciation: /ˈferəs/Translate ferrous | into German | into Italian Definition of ferrous adjective (chiefly of metals) containing or consisting of iron. Chemistry of iron with a valence of two; of iron(II). Compare with ferric.Origin: mid 19th century: from Latin ferrum 'iron' + -ousferrous in other Oxford dictionaries Definition of ferrous in the British & World English dictionary