muscimolPronunciation: /ˈmʌskɪmɒl/Definition of muscimol noun [mass noun] Chemistry a narcotic and hallucinogenic compound found in the fly agaric and other fungi. An alkaloid related to oxazole; chemical formula: C4H6N2O2 Origin: 1960s: from modern Latin muscaria (see muscarine) + im(ine) + -ol