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

-ousness

suffix

Definition of -ous in: