Immediate provenance uncertain. Loan <- Alb. dru m. 'tree' f. 'wood' according to Orel; alternatively, may also be <- Gr. δρῦς f. ‘tree, (especially) oak’ (DEX)., Origin uncertain. Borrowed either from Alb. dru m. 'tree' f. 'wood' (AED); or from Gr. δρῦς f. ‘tree, (especially) oak’ (DEX).
Orel, Vladimir E. (1998). Albanian etymological dictionary. Leiden: Brill
DEX online (2004-2015). Dicționare ale limbii române. https://dexonline.ro/
Robert Farren, PIE culture words collection, 2017
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