WordReference Random House Unabridged Dictionary of American English © 2017
fla•tus  (flātəs),USA pronunciation n., pl.  -tus•es. 
  1. Medicine, Physiologyintestinal 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. 
  • Neo-Latin; Latin: a blowing, breathing, breath, equivalent. to flā(re) to blow + -tus suffix of verb, verbal action
  • 1660–70


Collins Concise English Dictionary © HarperCollins Publishers::

flatus /ˈfleɪtəs/ n ( pl -tuses)
  1. gas generated in the alimentary canal
Etymology: 17th Century: from Latin: a blowing, snorting, from flāre to breathe, blow



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