the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.
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Question 1 of 9
You may have read the word "simmer" in a recipe or two, but what does it really mean?
Compare secondary rainbow.
Origin of primary rainbow
First recorded in 1785–95
Words nearby primary rainbow
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020