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The Collaborative International Dictionary of English v.0.48 (gcide)

Rat-tail \Rat"-tail`\ (r[a^]t"t[=a]l`), a.
Like a rat's tail in form; as, a rat-tail file, which is
round, slender, and tapering. See Illust. of {File}.
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Rat-tail \Rat"-tail`\, n.
1. (Far.) pl. An excrescence growing from the pastern to the
middle of the shank of a horse.
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2. (Zool.)
(a) The California chimaera. See {Chimaera}.
(b) Any fish of the genus {Macrurus}. See {Grenadier}, 2.
[1913 Webster]