a. (Zool.) Having a long, tapering tail like that of a rat. [ 1913 Webster ]

Rat-tailed larva (Zool.), the larva of a fly of the genus Eristalis. See Eristalis. --
Rat-tailed serpent (Zool.), the fer-de-lance. --
Rat-tailed shrew (Zool.), the musk shrew. [ 1913 Webster ]

a. Like a rat's tail in form; as, a rat-tail file, which is round, slender, and tapering. See Illust. of File. [ 1913 Webster ]

n. 1. (Far.) pl. An excrescence growing from the pastern to the middle of the shank of a horse. [ 1913 Webster ]

2. (Zool.) (a) The California chimaera. See Chimaera. (b) Any fish of the genus Macrurus. See Grenadier, 2. [ 1913 Webster ]