-ous Definition
əs
suffix
Possessing; full of; characterized by.
Joyous.
American Heritage
Having a valence lower than that of a specified element in compounds or ions named with adjectives ending in -ic:
Ferrous.
American Heritage
affix
Having, full of, characterized by.
Beauteous, capacious.
Webster's New World
Having a lower valence than is indicated by the suffix -ic.
Mercurous.
Webster's New World
noun
Plural form of ou.
Wiktionary
Origin of -ous
Middle English from Old French -ous, -eus, -eux from Latin -ōsus -us adj. suff
From American Heritage Dictionary of the English Language, 5th Edition
ME < L -us & OFr -ous, -eus, < L -osus
From Webster's New World College Dictionary, 5th Edition
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