The Collaborative International Dictionary of English v.0.48:

Inca \In"ca\, n.
   (a) An emperor or monarch of Peru before, or at the time of,
       the Spanish conquest; any member of this royal dynasty,
       reputed to have been descendants of the sun.
   (b) pl. The people governed by the Incas, now represented by
       the Quichua tribe.
       [1913 Webster]

   Inca dove (Zool.), a small dove (Scardafella inca),
      native of Arizona, Lower California, and Mexico.
      [1913 Webster]