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-acious

1.
a suffix forming adjectives that correspond to nouns ending in the suffixes -acity, and -acy: audacious; fallacious .
Origin
< Latin -āci- (stem of -āx) adj. suffix + -ous
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for -acious

adjectival word-forming element meaning "given to, inclined to, abounding in," from Latin -aci- (nominative -ax), noun ending used with verbal stems, + -ous.

Online Etymology Dictionary, © 2010 Douglas Harper
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