(chemistry) a peroxide

nitrogen monoxide

(inorganic chemistry) nitrogen dioxide

carbon monoxide

(chemistry) basic oxide

Synonym of 亜酸化窒素 (asanka chisso, “nitrous oxide”); dinitrogen monoxide

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds