-ous Syllabification: (-ous)Definition of -ous suffix forming adjectives: 1characterized by; of the nature of:dangerous mountainous 2 Chemistry denoting an element in a lower valence:ferrous sulfurousCompare with -ic.Origin:from Anglo-Norman French, or Old French -eus, from Latin -osus-ous in other Oxford dictionaries Definition of -ous in the British & World English dictionary
