Proto-Indo-European was strongly related to a biocultural habitat with trees and chestnuts
Indo-European
Hellenic kástanon chestnut
Greek kástano chestnut
Albanian gështenjë chestnut
Balto-Slavic *késten chestnut
Latvian kastanis chestnut
Lithuanian kaštonas chestnut
Slovak gaštan chestnut
Belarusian kaštán chestnut
Bulgarian késten chestnut
Croatian kesten chestnut
Czech kaštan chestnut
Macedonian kósten chestnut
Polish kasztan chestnut
Russian kaštán chestnut
Serbian kesten chestnut
Slovenian kostanj chestnut
Germanic kastan(i)e chestnut
Danish kastanje chestnut
Dutch kastanje chestnut
Old English chesten chestnut
German kastanie chestnut
Norwegian kastanje chestnut
Swedish kastanj chestnut
Celtic castan chestnut
Welsh castan chestnut
Old Irish castán chestnut
Breton kistin chestnut
Latin castanea chestnut
Italian castagna chestnut
French châtaigne chestnut
Spanish castaña chestnut
Romanian castană chestnut
Portuguese castanha chestnut
Sardinian castànza chestnut
Catalan castanya chestnut
Galician castaña chestnut
Indo-Iranian
Sanskrit kashta tree
Persian kastana tree
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Indo-European
Proto-Anatolian *tṓru- wood, tree
Hittite taru tree
Anatolian dōru chestnut
Hellenic drũs oak
Greek drys oak
Proto-Albanian dru wood, log
Albanian drusk oak
Baltic *der̃w-ā̂ resinous wood
Latvian darva tar
Lithuanian derva tar
Slavic *dervo tree
Slovak drevo tree
Belarusian dzjérava tree
Bulgarian dǎrvó tree
Croatian dȑvo tree
Czech dřevo wood
Macedonian drvo tree
Polish drzewo tree
Russian dérevo tree
Serbian dȑvo tree
Slovenian drevọ̑ tree
Ukrainian kdérevo tree
Germanic *tri(w)u tree
Danish trä tree
Dutch teer tar
Old English trēow tree
German teer tar
Norwegian tre tree
Swedish träd tree
Celtic *daru, *derwā oak
Welsh derw-en oak
Old Irish daur oak
Breton dervenn oak
Latin dūrus hard
Italian duro hard
French dur hard
Spanish duro hard
Romanian dur hard
Portuguese duro hard
Sardinian duru hard
Catalan duro hard
Galician duro hard
Interesting how we can find similar roots for other related words in diverse Indo-European languages.
In Hittite taru tree and in Portuguese we have tora, as a part of the logged tree and árvore is tree - from the Latin arbor and Hittite arra, all related and similar from the forests. In Portuguese carvalho is oak.
ORIGINAL RESEARCH
Biocultural diversity of common walnut (Juglans regia L.) and sweet chestnut (Castanea sativa Mill.) across Eurasia
Paola Pollegioni1
DOI: 10.1002/ece3.6761
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7593191/