• synonyms


[far-uh d, -ad]
noun Electricity.
  1. 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
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Origin of farad

First recorded in 1860–65; named after M. Faraday
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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.

British Dictionary definitions for farad


  1. 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 coulombSymbol: F
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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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

farad in Medicine


(fărəd, -ăd′)
  1. 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.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

farad in Science


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