fevertwig (English) comes from English fever, from Middle English fever, from Old English fefer, from Latin febris, from Proto-Italic *feɣʷris, from Proto-Indo-European dʰegʷʰris, from Proto-Indo-European dʰegʷʰ- — to burn; warm, hot.
Ancestry of “fevertwig”, step by step
fevertwig traces back through two separate lines of ancestry.