eureka UK /jəˈɹiː.kə/US /jʊˈɹiː.kə/exclamation 1noun 1phrases 1 exclamation1 •An exclamation indicating a sudden discovery.I rolled back the rug and eureka - there it was! noun1 •Synonym of constantan (“copper-nickel alloy”). Phrases with eureka eureka momentThe moment of a sudden unexpected discovery.
