Definition of -ous

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

History and Etymology for -ous

Middle English, from Anglo-French -us, -ous, from Latin -osus

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Cite this Entry

“-ous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/-ous. Accessed 2 Jun. 2020.

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English Language Learners Definition of -ous

: full of : having a large amount of : having the quality of
\ əs \

Kids Definition of -ous

: full of : having : resembling dangerous poisonous

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