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Definitions of rat-tail:
noun: (slang) A towel that has been tightly twisted along the diagonal to make a rudimentary whip with a towel corner at the tip, typically used in juvenile pranks.
noun: An excrescence growing from the pastern to the middle of the shank of a horse.
noun: A fish, the California chimera, Hydrolagus colliei, syn. Chimaera colliei.
noun: Any fish of the genus Macrourus; a grenadier.