Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for rainbow from the 1913 edition of Webster's Revised Unabridged Dictionary. Define rainbow using one of the most comprehensive free online dictionaries on the web.

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rainbow
Part of Speech: noun
Results: 1
1. A bow or arch exhibiting, in concentric bands, the several colors of the spectrum, and formed in the part of the hemisphere opposite to the sun by the refraction and reflection of the sun's rays in drops of falling rain.
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