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