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primary rainbow

noun
1.
the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.
Origin of primary rainbow
1785-1795
1785-95
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for primary rainbow
Historical Examples
  • The ordinary or primary rainbow has a radius of about 42 degrees at its outer edge.

    Meteorology Charles Fitzhugh Talman

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Word Value for primary

14
15
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