Atter is an older germanic term for "poisonous bodily fluid", especially venom of a venomous animal, such as a snake, dragon or other reptile, but also other vile corrupt or morbid substance from the body, such as pus from a sore or wound, as well as bitter substance, such as bile.[1][2][3] Figuratively, it can also mean moral corruption or corruptness; noxious or corrupt influence, poison to the soul, evil, anger, envy, hatred; as well as destruction and death.[1][3]
Today, atter is commonly associated with the Norse mythology, where it plays an important role in various contexts – see subsequent section: § In Norse mythology.