aine omadus avaldada organismile kahjulikku toimet peagi pärast ühekordset või 24 tunni jooksul toimunud korduvat kokkupuudet ainega, the ability of a substance to cause severe biological harm or death soon after a single exposure or dose or a series of doses received within a 24-hour period. Also, any poisonous effect resulting from short-term exposure to a toxic substance.