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Latin word diabolus comes from Ancient Greek διάβολος (diábolos - slanderer, devil), which derives from the word διαβάλλω (I slander) - a combinatin of διά (diá - "through") with βάλλω (bállō - "I throw")
διάβολος (Ancient Greek)
Slanderer, devil.
diabolus (Latin)
Devil.