The Collaborative International Dictionary of English v.0.48:

Macrochires \Mac`ro*chi"res\, n. pl. [NL., fr. Gr. makro`s long
   + ? hand.] (Zool.)
   A division of birds including the swifts and humming birds.
   So called from the length of the distal part of the wing.
   [1913 Webster]