a suffix forming adjectives that correspond to nouns ending in the suffixes -acity and -acy: audacious; fallacious.

Nearby words

  1. -ably,
  2. -ac,
  3. -acea,
  4. -aceae,
  5. -aceous,
  6. -acity,
  7. -acy,
  8. -ad,
  9. -ade,
  10. -adelphous

Origin of -acious

< Latin -āci- (stem of -āx) adj. suffix + -ous

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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