Where does “aurora australis” come from?

aurora australis (Latin) comes from Latin aurora, from Proto-Italic auzōs, from Proto-Indo-European h₂éwsōs, from Proto-Indo-European h₂éws-os-s, from Proto-Indo-European h₂ews- — dawn; east; to draw water, scoop up.

Ancestry of “aurora australis”, step by step

aurora australis traces back through two separate lines of ancestry.

via Latin aurora

StepLanguageWordMeaning
1Latinauroradawn, sunrise
2Proto-Italicauzōsdawn
3Proto-Indo-Europeanh₂éwsōsdawn; goddess of dawn, bringer of light for which...
4Proto-Indo-Europeanh₂éws-os-s
5Proto-Indo-Europeanh₂ews-dawn; east; to draw water, scoop up

via Latin australis

StepLanguageWordMeaning
1Latinaustralissouthern; Australian; the south pole
2LatinausterThe south wind; south
3Proto-Italic*austeros
Every word from Proto-Indo-European h₂ews-Every word from Proto-Indo-European h₂éws-os-sEvery word from Proto-Indo-European h₂éwsōs