What does australis mean?
Australis is a Latin adjective meaning 'southern'. It does not function as an ordinary everyday English adjective; instead, it survives in English almost entirely inside formal scientific and astronomical terminology, where it is placed after the noun it describes, following classical Latin word order. Its best-known appearance is Aurora australis, the name for the southern lights — the luminous atmospheric display that mirrors the better-known northern aurora borealis. Naturalists have also used australis as a species epithet for many plants and animals found in the Southern Hemisphere or the southern parts of a continent. For general readers, the practical value of knowing the word lies in decoding such names: whenever you encounter australis in a scientific context, you can reliably read it as 'of the south'. It derives from the Latin auster, the south wind, the same root that gives us 'austral' and, ultimately, the name Australia.
adjectiveLatin adjective meaning 'southern', used in English chiefly in fixed scientific and astronomical names such as Aurora australis, the southern lights.
- Southern; of the south, used postpositively in Latin scientific names (as in Aurora australis)
"The expedition photographed the aurora australis shimmering over the Antarctic ice."
"The aurora australis danced above the research station during the polar winter."
"Botanists gave the species the epithet australis to mark its southern range."
Every scientific name ending in '-australis' is a little piece of living Latin — a label meaning simply 'southern' that biologists have stamped on penguins, eels, and even the southern lights.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of australis
Australis is the feminine nominative singular of the Latin adjective australis, meaning 'southern', formed from auster, the Latin word for the south wind. It entered learned English usage through Renaissance scientific Latin, which borrowed freely from classical vocabulary for taxonomy and astronomy. It shares this root with the English adjective 'austral' and with the name Australia, coined from the same Latin source.
How australis is actually used
Strictly a Latin word rather than a fully naturalized English one; in English text it appears almost only as part of binomial names and set phrases, where it follows the noun it modifies (postpositive position), unlike native adjectives.
Easily confused with australis
'Austral' is the English adjective meaning 'southern', while 'australis' is the Latin form used almost exclusively within fixed scientific names.