amyl nitrite UK /am.ɪl ˈnʌɪ.tɹʌɪt/US /ˌæm.əl ˈnaɪˌtɹaɪt/ noun1 •A yellowish volatile synthetic liquid C₅H₁₁NO₂ of commercial amyl alcohol and nitrous acid that is used medicinally as a vasodilator. It is rapidly absorbed by the body on inhalation, and is sometimes used recreationally especially as an aphrodisiac.