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n. (Zool.) A northern duck 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. (Zool.) The sharp-tailed grouse of the great plains and Rocky Mountains (Pediocætes phasianellus); - called also pintailed grouse, pintailed chicken, springtail, and sharptail.