-ous
adjective suffix
1
: full of : abounding in : having : possessing the qualities of
clamorous
poisonous
2
: having a valence lower than in compounds or ions named with an adjective ending in -ic
mercurous
Word History
Etymology
Middle English, from Anglo-French -us, -ous, from Latin -osus
Kids Definition
-ous
adjective suffix
əs
: full of : having : resembling
dangerous
poisonous