Definition of -ous in English:

-ous

suffix

Forming adjectives:
1Characterized by; of the nature of: dangerous mountainous
2 Chemistry Denoting an element in a lower valency: ferrous sulphurous Compare with -ic.

Origin

from Anglo-Norman French, or Old French -eus, from Latin -osus.

Derivatives

-ously

suffix
Forming corresponding adverbs.

-ousness

suffix
Forming corresponding nouns.

Definition of -ous in:

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Word of the day abjure
Pronunciation: abˈjo͝or
verb
solemnly renounce (a belief, cause, or claim)