Glossary of Medical Terms

Our online medical glossary of medical terms and definitions includes definitions for terms related to treatment, and general medicine

RAINBOW

A bow or arch exhibiting, in concentric bands, the different colours of the spectrum, and formed in the part of the hemisphere opposite to the sun by the refraction and reflection of the sun's rays in drops of falling rain. Besides the usual bow, called also primary rainbow, which is formed by two refractions and one reflection, there is also other often seen exterior to it, called the secondary rainbow, concentric with the first, and separated from it by a little interval. It is formed by two refractions and two reflections, is many fainter than the primary bow, and has its colours 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 See Wrasse. Supernumerary rainbow, a less bow, generally of red and green colours only, sometimes seen within the primary or without the secondary rainbow, and in contact with them. Origin: AS. Regenboga, akin to G. Regenbogen. See Rain, and Bow anything bent. Source: Websters Vocabulary
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