Amazonian

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of or relating to the Amazon River or to Amazonia.
• adjective Characteristic of or resembling an Amazon.
• adjective Strong and aggressive. Used of women.

from The Century Dictionary.

• Pertaining to or resembling an Amazon: in the following extract, beardless.
• Bold; of masculine manners; warlike; quarrelsome: applied to women.
• Belonging to the river Amazon, in South America, or to the country lying on that river.

from the GNU version of the Collaborative International Dictionary of English.

• adjective Pertaining to or resembling an Amazon; of masculine manners; warlike.
• adjective Of or pertaining to the river Amazon in South America, or to its valley.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective Of or relating to the Amazons; aggressive and warlike.
• adjective Having to do with the Amazon River in South America, and its surrounding region.
• adjective Of or relating to the most recent Martian geological time period.
• adjective of a woman very tall, strong and athletic.
• proper noun The Amazonian geological period.
• noun An Amazon.