Where does “fevertwig” come from?

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.

via English fever

StepLanguageWordMeaning
1EnglishfeverA higher than normal body temperature of a person...
2Middle Englishfever—
3Old Englishfefer—
4Latinfebrisfever
5Proto-Italic*feɣʷrisfever
6Proto-Indo-Europeandʰegʷʰris—
7Proto-Indo-Europeandʰegʷʰ-to burn; warm, hot

via English twig

StepLanguageWordMeaning
1EnglishtwigA small thin branch of a tree or bush; To beat...
2Irishtuigunderstand
3Middle Irishtuicid—
4Old Irish·tucci—
5Proto-Celtic*unketi—
6Proto-Indo-European*h₁unékti—
Every word from Proto-Indo-European dʰegʷʰ- →Every word from Proto-Indo-European dʰegʷʰris →Every word from Proto-Italic *feɣʷris →