-ious Definition
ēəs, yəs, əs
suffix
Having; having the qualities of; full of.
Bilious.
American Heritage
Alternative spelling of -ous.
Wiktionary
affix
Having, characterized by.
Furious.
Webster's New World
Forming adjectives corresponding to nouns ending in -ion.
Rebellious, religious.
Webster's New World
noun
Plural form of IOU.
Wiktionary
Origin of -ious
Middle English partly from Latin -ius and partly from Old French -ieus, -ieux (from Latin -iōsus)
From American Heritage Dictionary of the English Language, 5th Edition
-i- + -ous
From Wiktionary
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