-ous
adjective suffix Etymology: Middle English, from Anglo-French -us, -ous, from Latin -osus 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
>

New Collegiate Dictionary. 2001.

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