Where does “quiēscēns” come from?
quiēscēns (Latin) comes from Latin quiēscō, from Latin quiēs, from Proto-Italic kʷiētis, from Proto-Indo-European kʷyéh₁tis, from Proto-Indo-European kʷyeh₁- — to rest; rest, peace.
Ancestry of “quiēscēns”, step by step