Webster's English Dictionary

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rainbow

rain.bow \'ra-n-.bo-\ n 1: an arc or circle that exhibits in concentric 
   bands the colors of the spe ctrum and that is formed opposite the sun by 
   the refraction and reflection of the sun's rays in raindrops, spray, or 
   mist 2a: a multicolored array  2b: a wide assortment or range  3: ILLUSION