Definition of pintails:
(n) :
A pintail duck, a type of dabbling duck with a characteristic pointed tail.
(n) :
A northern pintail, Anas acuta, a dabbling duck of the northern hemisphere that has a long pointed tail.
(n) :
(surfing) A surfboard with a pointed back end.
(n) :
(engineering) The end of a fastening pin or mandrel on a Huckbolt or pop rivet that is broken off when installation is complete.
(n) :
A pin-tailed snipe, Gallinago stenura.
(n) :
Any of various species of libellulid dragonfly of the genus Acisoma, endemic to Africa and Asia.