[rain.bow] n (bef. 12c) 1: an arc or circle that exhibits in concentric bands the colors of the spectrum and that is formed opposite the sun by the refraction and reflection of the sun's rays in raindrops, spray, or mist
2. a: a multicolored array b: a wide assortment or range 3 [fr. the impossibility of reaching the rainbow, at whose foot a pot of gold is said to be buried]: an illusory goal or hope
4: rainbow trout -- rain.bow.like adj