Breadcrumb Home > Thesaurus > O Synonyms of oestrus Find synonyms for: Noun1. estrus, oestrus, heat, rut, physical condition, physiological state, physiological conditionusage: applies to nonhuman mammals: a state or period of heightened sexual arousal and activity2. Oestrus, genus Oestrus, arthropod genususage: type genus of the Oestridae: sheep botfliesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of oestrus (Dictionary) ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language