The Collaborative International Dictionary of English v.0.48:

Ainu \Ai"nu\, n. [Said to be the native name for man.]
   One of a peculiar race found primarily in Hokkaido, in the
   northern part of the empire of Japan, the Kurile Islands, and
   nearby. They are believed to be the native inhabitants of the
   Japanese islands. The Ainus are stout and short, with hairy
   bodies. Also called Aino and hairy Ainu.
   [1913 Webster +PJC]