1. [n]  the basic unit of money in Argentina; equal to 100 centavos
2. [adj]  of the south or coming from the south; "sailed the austral seas"
3. [adj]  relating to or coming from the south; "austral winds"

AUSTRAL is a 7 letter word that starts with A.

1. \Aus"tral\, a. [L. australis, fr. auster: cf. F.
   austral.]
   Southern; lying or being in the south; as, austral land;
   austral ocean.
   {Austral signs} (Astron.), the last six signs of the zodiac,
      or those south of the equator.
   

2. \Aus"tral\, a. (Biogeography)
   Designating, or pert. 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.