primary rainbow

noun
the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.


Origin:
1785–95

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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The second rainbow is dimmer than the lower, primary rainbow.
The rainbow normally seen is called the primary rainbow.
The interior color on the primary rainbow is red, and violet is a secondary rainbow.
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