pustuleyoudaoicibaDictYouDict
pustule: [14] Despite the fact that pustules contain pus, there is no etymological connection between the two words. Pustule comes via Old French pustule from Latin pustula ‘blister’. This was a derivative of a prehistoric Indo-European base *pu- signifying ‘blow’, so etymologically it means ‘inflated area’.
flatulence (n.)youdaoicibaDictYouDict
1711, from French flatulence, from flatulent (see flatulent). Flatulency is from 1650s.
flatulent (adj.)youdaoicibaDictYouDict
"affected by digestive gas," 1590s, from Middle French flatulent (16c.), from Modern Latin flatulentus, from Latin flatus "a blowing, breathing, snorting; a breaking wind," past participle of flare "to blow, puff," which is cognate with Old English blawan (see blow (v.1)).
pustule (n.)youdaoicibaDictYouDict
late 14c., from Old French pustule (13c.) and directly from Latin pustula "blister, pimple," from PIE imitative root *pu- (1) "blow, swell," on notion of "inflated area" (cognates: Sanskrit pupphusah "lung," Greek physa "breath, blast, wind, bubble," Lithuanian puciu "to blow, swell," Old Church Slavonic puchati "to blow"). Compare emphysema. Related: Pustulant; pustular.