Merriam-Webster Collegiate Dictionary - dioscuri

 noun plural  Etymology: New Latin, from Greek Dioskouroi, literally, sons of Zeus, from Dios (genitive of Zeus; akin to Latin divus divine) + kouroi, plural of kouros, koros boy — more at deity, crescent  Date: 1640 the twins Castor and Pollux reunited as stars in the sky by Zeus after Castor's death and regarded as patrons of athletes and sailors