/ Dictionary / Index T Thaïs: Meaning and Definition of Find definitions for: Tha•ïs Pronunciation: (thā'is), [key] — n. fl. late 4th centuryb.c.,Athenian courtesan: mistress of Alexander the Great and Ptolemy I. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thais (Thesaurus) Thailand Thai stick Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language