FluentPlex

eureka

/jʊˈɹiː.kə/ interjection C1
  1. An exclamation indicating a sudden discovery. · I rolled back the rug and eureka - there it was!
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From the library

Old Anthony Rockwall, retired manufacturer and proprietor of Rockwall’s Eureka Soap, looked out the library window of his Fifth Avenue mansion and grinned.
Six stories from The Four Million, p. 8 · C1
Now I use the old Eureka—not only for sentiment, but it’s the purest soap made.
Six stories from The Four Million, p. 9 · C1
You’ve got no Eureka soap on ’em.
Six stories from The Four Million, p. 10 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.