/ Dictionary / Index T terrestrial planet: Meaning and Definition of Find definitions for: terres'trial plan'et. Pronunciation: [key] — Astron. Astron. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. terrestrial globe terrestrial telescope Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language