Note: Besides the ordinary bow, called also primary rainbow,
which is formed by two refractions and one reflection,
there is also another often seen exterior to it, called
the secondary rainbow, concentric with the first, and
separated from it by a small interval. It is formed by
two refractions and two reflections, is much fainter
than the primary bow, and has its colors arranged in
the reverse order from those of the latter.
{Lunar rainbow}, a fainter arch or rainbow, formed by the
moon.
{Marine rainbow}, or {Sea bow}, a similar bow seen in the
spray of waves at sea.
{Rainbow trout} (Zo["o]l.), a bright-colored trout
({Salmoirideus}), native of the mountains of California,
but now extensively introduced into the Eastern States.
Japan, and other countries; -- called also {brook trout},
{mountain trout}, and {golden trout}.
{Rainbow wrasse}. (Zo["o]l.) See under {Wrasse}.
{Supernumerary rainbow}, a smaller bow, usually of red and
green colors only, sometimes seen within the primary or
without the secondary rainbow, and in contact with them.