Where does “căstănaș” come from?

căstănaș (Romanian) comes from Romanian castan, from Latin castaneus, from Latin -eus, from Ancient Greek -εῖος, from Proto-Indo-European -iHwós, from Proto-Indo-European -wós — Creates adjectives from verb stems.

Ancestry of “căstănaș”, step by step

StepLanguageWordMeaning
1Romaniancastanchestnut tree
2Latincastaneuschestnut; brown
3Latin-eusargentum + API → argenteus; ferrum + API →...
4Ancient Greek-εῖοςForms adjectives, usually with a meaning of "of"...
5Proto-Indo-European-iHwós
6Proto-Indo-European-wósCreates adjectives from verb stems
Every word from Proto-Indo-European -wós