from the GNU version of the Collaborative International Dictionary of English
- adj. Having a tapered tail, with the middle feathers longest; -- said of birds.
from The Century Dictionary and Cyclopedia
- Having the tail narrowly cuneate, with long acute central feathers, as the pintail duck, Dafila acuta.
- Having the individual feathers of the tail stiff, narrow, and pointed, as the pintail ducks of the genus Erismatura.
Sorry, no etymologies found.