1. rat-tail - Noun
2. rat-tail - Adjective
Like a rat's tail in form; as, a rat-tail file, which is round, slender, and tapering. See Illust. of File.
An excrescence growing from the pastern to the middle of the shank of a horse.
The California chimaera. See Chimaera.
Any fish of the genus Macrurus. See Grenadier, 2.
Source: Webster's dictionary