Where does “кашель” come from?
кашель (Russian) comes from Cornish kasel, from Proto-Slavic kaš(ь)ľь, from Proto-Balto-Slavic kāˀsulia, from Proto-Balto-Slavic kāˀs-, from Proto-Indo-European kʷeh₂s- — to cough.
кашель (Russian): cough
Ancestry of “кашель”, step by step