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eureka

[yoo-ree-kuh, yuh-]
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interjection
  1. (initial capital letter) I have found (it): the reputed exclamation of Archimedes when, after long study, he discovered a method of detecting the amount of alloy mixed with the gold in the crown of the king of Syracuse.
  2. (used as an exclamation of triumph at a discovery.)
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Origin of eureka

1560–70; < Greek heúrēka, 1st person singular perfect indicative of heurískein to find, discover

Eureka

[yoo-ree-kuh, yuh-]
noun
  1. a city in NW California.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for eureka

eureka

interjection
  1. an exclamation of triumph on discovering or solving something
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Word Origin

C17: from Greek heurēka I have found (it), from heuriskein to find; traditionally the exclamation of Archimedes when he realized, during bathing, that the volume of an irregular solid could be calculated by measuring the water displaced when it was immersed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for eureka

c.1600, from Greek heureka "I have found (it)," first person singular perfect active indicative of heuriskein "to find" (see heuristic). Supposedly shouted by Archimedes (c.287-212 B.C.E.) when he solved a problem that had been set to him: determining whether goldsmiths had adulterated the metal in the crown of Hiero II, king of Syracuse.

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Online Etymology Dictionary, © 2010 Douglas Harper

eureka in Culture

Eureka!

[(yoo-ree-kuh)]

A Greek word meaning “I have found it!” An exclamation that accompanies a discovery: “When she finally located the rare book, the scholar cried, ‘Eureka!’” (See Archimedes.)

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The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.