primary rainbow

noun

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

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Nearby words

primary processes, primary producer, primary pulmonary lobule, primary qualities, primary quality, primary rainbow, primary reaction, primary root, primary school, primary sex characteristic, primary spermatocyte

Compare secondary rainbow.

Origin of primary rainbow

First recorded in 1785–95

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019