(neuroscience) chemotransmitter

stoichiometry

"chemical flavoring", any umami flavoring agent, usually MSG

“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

The hiragana syllable げ (ge) or the katakana syllable ゲ (ge) in Japanese braille.