Webster's English Dictionary

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dioscuri

Di.os.cu.ri \di--'a:s-ky*-.ri-, .di--*-'skyu.(*)r-.i-\ n [Gk Dioskouroi, 
   lit., sons of Zeus, fr. Dios (gen. of Zeus; a] pl kin to L divus divine) + 
   kouroi, pl. of koros, kouros boy, son : the twins Castor and Pollux 
   reunited after Castor's death by Zeus's decr ee that they live in the upper 
   and lower worlds on alternate days