Etymology

From Proto-Iranian, from Proto-Indo-Iranian *HastH-, from Proto-Indo-European *h₃estH-, *h₃ost-. Cognate with Persian است ‎(ast), Avestan 𐬀𐬯𐬙𐬌 ‎(asti-), Sanskrit and Hindi अस्थि ‎(asthi), Latin os (Italian osso), Ancient Greek ὀστέον ‎(ostéon) (Greek οστό ‎(ostó)), Old Armenian ոսկր ‎(oskr) (Armenian ոսկոր ‎(oskor)).