Where does “artsenij” come from?

artsenij (Dutch) comes from Middle Dutch arsenie, from Ancient Greek Ἀρσένῐος, from Ancient Greek ἄρσην, from Proto-Indo-European wr̥s-, from Proto-Indo-European wers-, from Proto-Indo-European wer- — to burn; to cover, heed, notice; squirrel.

artsenij (Dutch): medicine, medical practice or study; medicine,...