Breadcrumb Home > Thesaurus > T Synonyms of tombaugh Find synonyms for: Noun 1. Tombaugh, Clyde Tombaugh, Clyde William Tombaugh usage: United States astronomer who discovered the planet Pluto (1906-1997) WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of tombaugh (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: demagogue Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language