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[far-uh d, -ad] /ˈfær əd, -æd/
noun, Electricity.
the standard unit of capacitance in the International System of Units (SI), formally defined to be the capacitance of a capacitor between the plates of which there appears a potential difference of one volt when it is charged by a quantity of electricity equal to one coulomb. Symbol: F.
Origin of farad
First recorded in 1860-65; named after M. Faraday Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for farad
Historical Examples
  • farad, the unit of electrical energy, so called from faraday.

    The Nuttall Encyclopaedia Edited by Rev. James Wood
  • The farad being inconveniently large for practical use, one-millionth of a farad, called a microfarad, is generally adopted.

  • The capacity of a condenser which would contain a charge of one coulomb under one volt pressure is the farad.

  • Since the farad is far too large for practical purposes a millionth of a farad, or microfarad, whose symbol is mfd., is used.

    The Radio Amateur's Hand Book A. Frederick Collins
  • As this unit is inconveniently large, for practical applications the unit microfarad—millionth of a farad—is employed.

  • farad, the practical unit of capacity for electricity, in the electromagnetic system of units.

  • The condensers used in the above experiment have a capacity of one microfarad, or one millionth of a farad.

    Physics Willis Eugene Tower
  • The practical unit of capacity is called the micro-farad, the real unit is the farad, and takes its name from faraday.

British Dictionary definitions for farad


/ˈfærəd; -æd/
(physics) the derived SI unit of electric capacitance; the capacitance of a capacitor between the plates of which a potential of 1 volt is created by a charge of 1 coulomb F
Word Origin
C19: named after Michael Faraday
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 farad

unit of electric capacity, suggested 1861, first used 1868, named for English physicist Michael Faraday (1791-1867). Related: Faradic.

Online Etymology Dictionary, © 2010 Douglas Harper
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farad in Medicine

farad far·ad (fār'əd, -ād')
The unit of capacitance in the meter-kilogram-second system equal to the capacitance of a capacitor having a charge of 1 coulomb when a potential difference of 1 volt is applied.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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farad in Science
The SI derived unit used to measure electric capacitance. A capacitor in which a stored charge of one coulomb provides an electric potential difference of one volt across its plates has a capacitance of one farad.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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