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F, f

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noun, plural F's or Fs, f's or fs.
  1. the sixth letter of the English alphabet, a consonant.
  2. any spoken sound represented by the letter F or f, as in fat, differ, or huff.
  3. something having the shape of an F.
  4. a written or printed representation of the letter F or f.
  5. a device, as a printer's type, for reproducing the letter F or f.


  1. foot-second.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fs


abbreviation for
  1. foot-second
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

fs in Science


  1. Abbreviation of Fahrenheit
  2. The symbol for farad.
  3. The symbol for fluorine.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.