Where does “उत्तरध्रुवीय महासागर” come from?

उत्तरध्रुवीय महासागर (Hindi) comes from Sanskrit ध्रुवीय, from Sanskrit ध्रुव, from Proto-Indo-Iranian dʰruwás, from Proto-Indo-European dʰru-wó-s, from Proto-Indo-European -wós — Creates adjectives from verb stems.

Ancestry of “उत्तरध्रुवीय महासागर”, step by step

उत्तरध्रुवीय महासागर traces back through 3 separate lines of ancestry.

via Sanskrit ध्रुवीय

StepLanguageWordMeaning
1Sanskritध्रुवीय
2Sanskritध्रुवfixed, immovable; firm, stable; certain, sure,...
3Proto-Indo-Iraniandʰruwásfixed, firm
4Proto-Indo-Europeandʰru-wó-s
5Proto-Indo-European-wósCreates adjectives from verb stems

via Hindi उत्तर

StepLanguageWordMeaning
1Hindiउत्तरreply, answer; north; north, northern
2Sanskritउत्तरupper, higher, superior; better; later,...
3Proto-Indo-Iranianútˢtaras
4Proto-Indo-Europeanúdteroshigher, outer
5Proto-Indo-Europeanúdout, outward

via Hindi महासागर

StepLanguageWordMeaning
1Hindiमहासागरocean
2Sanskritमहासागर
Every word from Proto-Indo-European -wósEvery word from Proto-Indo-European dʰru-wó-sEvery word from Proto-Indo-Iranian dʰruwás