in Greek mythology, Castor and Polydeuces (Pollux), warrior-gods and tutelary protectors of sailors, twin sons of Zeus and Leda; a Latinized form of Greek Dioskouroi, literally "Zeus' boys," from Dios, genitive of Zeus (see Zeus) + kouroi, plural of kouros "boy, son," from PIE *korwo- "growing" (hence "adolescent"), from suffixed form of root *ker- (2) "to grow." Related: Dioscuric; Dioscurian.

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