Definition of "blacktail"

blacktail

noun
plural blacktails
1. A fish: the ruffe or pope (Gymnocephalus cernua)
  Quotations
  […] the blacke taile Perch [which ſome take for a Ruffe, others for a ſea Breame:]
  1601, Pliny the Elder, translated by Philemon Holland, The Historie of the World, London: A. Islip, published 1634, page 452
  Melarunus, the Black-tail, a kind of Perch of Ruff, a Fiſh; it alſo taken for a Sea-bream: […]
  1706, Edward Phillips, compiler, J
  A perch-like fish of European waters, the blacktail, striped or stone perch, is also known as a ruff or ruffe.
  1912, Harry Thurston Peck, The Standard Illustrated Book of Facts, New York, N.Y.: Syndicate Publishing Company, page 764
2. A black-tailed deer (Odocoileus hemionus columbianus), of California and Oregon.
3. A mule deer, of the Rocky Mountains.
4. Certain fish with black tails:
  1. (UK) Salmo trutta
  2. (South Africa, Namibia) Diplodus capensis, Diplodus sargus
  3. (Jamaica) Haemulon carbonarium