Where does “etherous” come from?

etherous (English) comes from English ous, from English ou, from Afrikaans ou, from Dutch oud, from Middle Dutch out, from Old Dutch ald, from Proto-West Germanic ald, from Proto-Germanic aldaz — to grow, nourish.

Ancestry of “etherous”, step by step

etherous traces back through two separate lines of ancestry.

via English ous

StepLanguageWordMeaning
1Englishousplural of ou
2EnglishouA probably extinct species of Hawaiian...
3AfrikaansouAn old fellow, guy, bloke; attributive form of...
4Dutchoudold
5Middle Dutchoutold
6Old Dutchald
7Proto-West Germanicaldold
8Proto-Germanicaldazold, grown up
9Proto-Indo-Europeanh₂eltós
10Proto-Indo-Europeanh₂él-to grow, nourish

via English Ether

StepLanguageWordMeaning
1EnglishEtherThe god-personification of the bright, glowing upper air of heaven. He is the Roman counterpart of Aether
2Old Frenchether
3Latinaethērsky, ether (distinct in this sense from caelum, which is where the night's stars are, but not always distinguished from āēr; always distinct from the underworld)
4Ancient GreekΑἰθήρUpper Air
5Ancient GreekαἴθωTo ignite, kindle, light; To burn, blaze
6Proto-Hellenic*áitʰōto ignite
Every word from Proto-Indo-European h₂él-Every word from Proto-Indo-European h₂eltósEvery word from Proto-Germanic aldaz