Source : Webster's Revised Unabridged Dictionary (1913)

Cultirostral \Cul`ti*ros"tral\ (-t?-r?s"tral), a. [See
   {Cultirostres}.] (Zo["o]l.)
   Having a bill shaped like the colter of a plow, or like a
   knife, as the heron, stork, etc.