/ Dictionary / Index T Tristan da Cunha: Meaning and Definition of Find definitions for: Tris•tan da Cu•nha Pronunciation: (tris'tun du k'nu, kn'yu), [key] a group of four volcanic islands in the S Atlantic, belonging to St. Helena. 40 sq. mi. (104 sq. km). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Tristan Tristan und Isolde* Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language