Definition of pintail:
- A northern duck ( Dafila acuta), native of both continents. The adult male has a long, tapering tail. Called also gray duck, piketail, piket- tail, spike- tail, split- tail, springtail, sea pheasant, and gray widgeon.
- The sharp- tailed grouse of the great plains and Rocky Mountains ( Pediocaetes phasianellus); - called also pintailed grouse, pintailed chicken, springtail, and sharptail.
Anas Acuta, pin-tailed duck.