-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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