окамене́лый (Russian) comes from Russian окаменеть, from Russian камене́ть, from Russian ка́мень, from Old East Slavic камень, from Proto-Slavic kamy, from Proto-Indo-European h₂éḱmō, from Proto-Indo-European h₂eḱ- — sharp.
окамене́лый (Russian): petrified, turned to stone