/ Dictionary / Index C Coos: Meaning and Definition of Find definitions for: Coos Pronunciation: (ks), [key] — n. a language of a group of American Indians indigenous to the coast of Oregon. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: coos (Thesaurus) Coorg Coos Bay Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language