Aus·tral a.
 1. Southern; lying or being in the south; as, austral land; austral ocean.
 2. Biogeography Designating, or pertaining to, a zone extending across North America between the Transition and Tropical zones, and including most of the United States and central Mexico except the mountainous parts.
 Austral signs Astron., the last six signs of the zodiac, or those south of the equator.
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