[fley-tuh s]
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noun, plural fla·tus·es.
  1. intestinal gas produced by bacterial action on waste matter in the intestines and composed primarily of hydrogen sulfide and varying amounts of methane.

Origin of flatus

1660–70; < New Latin; Latin: a blowing, breathing, breath, equivalent to flā(re) to blow + -tus suffix of v. action
Also called gas.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for flatus


noun plural -tuses
  1. gas generated in the alimentary canal

Word Origin for flatus

C17: from Latin: a blowing, snorting, from flāre to breathe, blow
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 flatus

1660s, from Latin flatus "a blowing," from flare "to blow" (see blow (v.1)).

Online Etymology Dictionary, © 2010 Douglas Harper

flatus in Medicine


  1. Gas generated in or expelled from the digestive tract, especially from the stomach or intestines.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.