primary rainbow
noun
the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.
Origin of primary rainbow
1First recorded in 1785–95
- Compare secondary rainbow.
Words Nearby primary rainbow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024
How to use primary rainbow in a sentence
The ordinary or primary rainbow has a radius of about 42 degrees at its outer edge.
Meteorology | Charles Fitzhugh Talman
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