secondary rainbow

a faint rainbow formed by light rays that undergo two internal reflections in drops of rain, appearing above the primary rainbow and having its colors in the opposite order.

1785–95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Since a small amount of energy is lost in the second reflection, the secondary rainbow is never as brilliant as the primary one.
The primary rainbow is the more prominent one inside, and the secondary rainbow is the fainter one outside.
The secondary rainbow is the result of two refractions and two internal reflections of the sunlight by the rain drops.
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