Austral/ˈɔːstrəl/ Definition 1 of 2Pro Tip 1/3Geographic Usage Used to describe things in the southern half of the Earth, below the equator. They explored austral ecosystems during their voyage. Pro Tip 2/3Not Only Weather While 'austral winds' is common, 'austral' can refer to geography, animals, or concepts. He specializes in austral bird species. Pro Tip 3/3Scientific Context Often used in scientific or academic discussions about the Southern Hemisphere. Austral climates vary greatly from tropical to polar.