Source : Webster's Revised Unabridged Dictionary (1913)

AEpyornis \[AE]`py*or"nis\, n. [Gr. ? high + ? bird.]
   A gigantic bird found fossil in Madagascar.

Epiornis \Ep`i*or"nis\, n. [NL.: cf. F. ['e]piornis. See
   {[AE]pyornis}.] (Zo["o]l.)
   One of the gigantic ostrichlike birds of the genus
   {[AE]piornis}, only recently extinct. Its remains have been
   found in Madagascar. [Written also {[AE]pyornis}.]

Source : WordNet®

aepyornis
     n : huge (to 9 ft.) extinct flightless bird of Madagascar [syn:
         {elephant bird}]