фтор (Kazakh) comes from Russian фтор, from French phthore, from Ancient Greek φθορά, from Ancient Greek φθείρω, from Proto-Hellenic kʷʰtʰéřřō, from Proto-Indo-European dʰgʷʰér-ye-ti, from Proto-Indo-European dʰgʷʰer- — flow, diverge; perish.
фтор (Kazakh): fluorine