/ Thesaurus / T Synonyms of terrestrial planet Find synonyms for: Noun1. terrestrial planet, planet, major planetusage: a planet having a compact rocky surface like the Earth's; the four innermost planets in the solar systemWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language