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Foucault

[foo-koh]
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noun
  1. Jean Ber·nard Lé·on [zhahn ber-nar ley-awn] /ʒɑ̃ bɛrˈnar leɪˈɔ̃/, 1819–68, French physicist.
  2. Michel [mee-shel] /miˈʃɛl/, 1926–84, French philosopher.
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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 foucault

Foucault

noun
  1. 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)
  2. Michel . 1926–84, French philosopher and historian of ideas. His publications include Histoire de la folie (1961) and Les Mots et les choses (1966)
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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

foucault in Science

Foucault

[fōō-kō]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.