Old English bana "killer, slayer, murderer, a worker of death" (human, animal, or object), also "the devil," from Proto-Germanic *banon, cognate with *banja- "wound" (source also of Old Frisian bona "murderer," Old Norse bani "death; that which causes death," Old High German bana "death, destruction," Old English benn "wound," Gothic banja "stroke, wound"), a word of no certain IE etymology. Sense of "that which causes ruin or woe" is from 1570s. Related: Baneful.
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