a burrowing snake, Farancia erytrogramma, of the southeastern U.S., having red and black stripes along the body, a red and yellow underside, and a sharp-tipped tail used in maneuvering prey.
Origin of rainbow snake
An Americanism dating back to 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for rainbow snake
What's the color of the rainbow-snake and of the cotton-mouth moccasin?The Purple Heights|Marie Conway Oemler