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[yoo-ree-kuh, yuh-] /yʊˈri kə, yə-/
(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.
(used as an exclamation of triumph at a discovery.)
Origin of eureka
1560-70; < Greek heúrēka, 1st person singular perfect indicative of heurískein to find, discover


[yoo-ree-kuh, yuh-] /yʊˈri kə, yə-/
a city in NW California. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for eureka
Contemporary Examples
Historical Examples
  • On the eureka lead I found five men holding a claim, that stood a good chance of being “on the line.”

    Lost Lenore Charles Beach
  • They mounted into the buggy, Dorothy holding eureka safe in her lap.

  • A fog-horn voice blared, "In eureka we'll promise free motor rides through the prettiest country—"

    Babbitt Sinclair Lewis
  • Dorothy held eureka in her arms and bade her friends a fond good-bye.

  • At this a great light broke around me, and I shouted ‘eureka!’

    The Moon Metal Garrett P. Serviss
British Dictionary definitions for eureka


an exclamation of triumph on discovering or solving something
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
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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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.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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eureka in Technology

A European technological development programme.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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