Where does “инопланетный” come from?

инопланетный (Russian) comes from Russian ино́й, from Old East Slavic инъ, from Proto-Slavic jьnъ, from Proto-Balto-Slavic *iˀnas, from Proto-Indo-European óynos — one; single.

инопланетный (Russian): extraterrestrial

Definitions

  1. extraterrestrial

Ancestry of “инопланетный”, step by step

инопланетный traces back through two separate lines of ancestry.

via Russian ино́й

StepLanguageWordMeaning
1Russianино́йdifferent; other
2Old East Slavicинъother, another
3Proto-Slavicjьnъother, another; different
4Proto-Balto-Slavic*iˀnas—
5Proto-Indo-Europeanóynosone; single

via Russian плане́та

StepLanguageWordMeaning
1Russianплане́таplanet
Every word from Proto-Indo-European óynos →Every word from Proto-Balto-Slavic *iˀnas →Every word from Proto-Slavic jьnъ →