Main Entry: ¹rain·bow

Pronunciation: \-ˌbō\

Function: noun

Date: before 12th century

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 <a rainbow of flavors>
3 [from 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 adjective