-ousyoudaoicibaDictYouDict[-ous 词源字典]
word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."[-ous etymology, -ous origin, 英语词源]