/ Thesaurus / D Synonyms of dawn horse Find synonyms for: Noun1. eohippus, dawn horse, horse, Equus caballususage: earliest horse; extinct primitive dog-sized four-toed Eocene animalWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: abstain Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language