one of the Fates (the one who holds the shears and determines the manner of a person's death and cuts the thread), from Greek, "inflexible, unchangeable," literally "not to be turned away," from a- "not" (see a- (3)) + stem of trepein "to turn" (from PIE root *trep- "to turn"). Related form atropa was the Greek name for deadly nightshade.

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