noun, plural flatuses.
intestinal gas produced by bacterial action on waste matter in the intestines and composed primarily of hydrogen sulfide and varying amounts of methane.
Also called gas.

1660–70; < Neo-Latin; Latin: a blowing, breathing, breath, equivalent to flā(re) to blow + -tus suffix of v. action

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World English Dictionary
flatus (ˈfleɪtəs)
n , pl -tuses
gas generated in the alimentary canal
[C17: from Latin: a blowing, snorting, from flāre to breathe, blow]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

from L. flatus "a blowing," from flare "to blow" (see blow (v.1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

flatus fla·tus (flā'təs)
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.
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Example sentences for flatus
Flatus is flammable, as both methane and hydrogen are flammable gases.
However, not all humans produce flatus that contains methane.
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