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[foo-koh] /fuˈkoʊ/
Jean Bernard Léon
[zhahn ber-nar ley-awn] /ʒɑ̃ bɛrˈnar leɪˈɔ̃/ (Show IPA),
1819–68, French physicist.
Michel [mee-shel] /miˈʃɛl/ (Show IPA), 1926–84, French philosopher. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for Foucault
Contemporary Examples
Historical Examples
  • The most convenient test is that of Foucault, a simple appliance for the purpose being shown in the figure .

    On Laboratory Arts Richard Threlfall
  • As for the horizontal freedom, Foucault used a fine steel wire.

    Spinning Tops John Perry
  • The velocity of light was experimentally found, in 1862, by Fizeau and Foucault, each using an independent method.

    History of Astronomy George Forbes
  • She used in later years to date from the time she had the Foucault frame.

  • Even the arc-light that Foucault produced in 1844 was not utilized then.

    Invention Bradley A. Fiske
British Dictionary definitions for Foucault


/French fuko/
Jean Bernard Léon (ʒɑ̃ bɛrnar leɔ̃). 1819–68, French physicist. He determined the velocity of light and proved that light travels more slowly in water than in air (1850). He demonstrated by means of the pendulum named after him the rotation of the earth on its axis (1851) and invented the gyroscope (1852)
Michel. 1926–84, French philosopher and historian of ideas. His publications include Histoire de la folie (1961) and Les Mots et les choses (1966)
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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Foucault in Science
French physicist who determined that light travels more slowly in water than in air, confirming predictions made by the wave theory of light. In 1850 Foucault also measured the absolute velocity of light. In 1851, by using a type of pendulum that is now named after him, Foucault demonstrated the rotation of the Earth, and in 1852 perfected a gyroscope for the same purpose.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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