rat-tail

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A long, thin length of hair that hangs down the nape of the neck, usually when the rest of the hair is cut short.
• adjective Shaped like or having a part shaped like a rat's tail.

from The Century Dictionary.

• noun A fish of the genus Macrurus, as M. fabricii or M. rupestris; the onion-fish or grenadier. See cut under Macrurus.
• noun A horse which has a tail bare or nearly bared of hair.
• noun One of various plants having tail-like flower-spikes, as the common plantain and the ribwort plantain, and various grasses, including species of Rottbœllia in the United States and Ischæmum laxum (Andropogon nervosus) in Australia.
• noun In farriery:
• noun An excrescence on a horse's leg, growing from the pastern to the shank.
• noun A disease which causes the hair of a horse's tail to fall off; also, a horse's tail thus denuded of hair. Also rat's-tail.
• Same as rat-tailed.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Far.) An excrescence growing from the pastern to the middle of the shank of a horse.
• noun The California chimæra. See Chimæra.
• noun Any fish of the genus Macrurus. See Grenadier, 2.
• adjective Like a rat's tail in form. See Illust. of file.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• 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 Macrurus; a grenadier.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun deep-sea fish with a large head and body and long tapering tail