The Collaborative International Dictionary of English v.0.48:

Amazonian \Am`a*zo"ni*an\, a.
   1. Pertaining to or resembling an Amazon; of masculine
      manners; warlike. --Shak.
      [1913 Webster]

   2. Of or pertaining to the river Amazon in South America, or
      to its valley.
      [1913 Webster] Amazonite