One of the mysteries of the English language finally explained.
A theory or doctrine of evil.
Late 19th century. From ancient Greek πονηρός oppressed, injurious, evil (from πόνος work, labour (from an ablaut variant ( o -grade) of the root of πένεσθαι to labour: see -penia) + -ηρος, extended form of -ρος, suffix forming adjectives) + -logy.
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