"affected by digestive gas," 1590s, from French flatulent (16c.), from Modern Latin flatulentus, from Latin flatus "a blowing, breathing, snorting; a breaking wind," past participle of flare "to blow, puff," from PIE root *bhle- "to blow."
1711, from French flatulence, from flatulent (see flatulent). Flatulency is from 1650s.
bhlē-, Proto-Indo-European root meaning "to blow," possibly a variant of PIE root *bhel- (2) "to blow, swell."
It forms all or part of: afflatus; bladder; blase; blast; blather; blaze (v.2) "make public;" blow (v.1) "move air;" conflate; deflate; flageolet; flatulent; flatus; flavor; inflate; inflation; insufflation; isinglass; souffle.