primary rainbow
noun
1.
the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water.
Compare
secondary rainbow
.
Origin
1785-95
Examples from the web for
primary rainbow
The second rainbow is dimmer than the lower,
primary rainbow
.
The rainbow normally seen is called the
primary rainbow
.
The interior color on the
primary rainbow
is red, and violet is a secondary rainbow.