/ Dictionary / Index A acarus: Meaning and Definition of Find definitions for: ac•a•rus Pronunciation: (ak'ur-us), [key] — pl. -a•ri a mite, esp. of the genus Acarus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: acarus (Thesaurus) acarpous acatalectic Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language