/ Dictionary / Index U Uncas: Meaning and Definition of Find definitions for: Un•cas Pronunciation: (ung'kus), [key] — n. 1588?–1683?, Mohegan leader. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. uncared-for uncase Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language