from the GNU version of the Collaborative International Dictionary of English
- adj. Having a tail which has the middle pair of feathers longest, the rest successively and decidedly shorter, and all more or less attenuate; -- said of certain birds. See Illust. of Wood hoopoe, under wood.
from The Century Dictionary and Cyclopedia
- Having the tail wedged or cuneate: noting birds whose tail-feathers are regularly graduated in length to such an extent that the tail when moderately spread appears to be beveled off obliquely at the end from the middle to the outermost feather on each side. It is a very common formation. See cuts under Sphenocercus, Sphenura, Triehoglossus, and Uroaëtus.
Sorry, no etymologies found.