tharm

From Middle English tharm, therm, from Old English þearm (“gut, entrail, intestine”), from Proto-West Germanic *þarm (“guts”), from Proto-Germanic *þarmaz (“guts”), from Proto-Indo-European *tórmos, *torh₂mo- (“hole”), from Proto-Indo-European *ter- (“to rub, bore, twist”). Cognate with Scots thairm (“gut; bowel; intestine”), North Frisian teerm (“bowel”), West Frisian term (“bowel”), Dutch darm (“bowel; gut; intestine”), German Darm (“gut; intestine; bowel”), Danish tarm (“bowel; gut; intestine”), Norwegian tarm (“intestine”), Norwegian Nynorsk tarm (“intestine”), Swedish tarm (“bowel; gut”), Icelandic þarmur (“bowel”), Latin trāmes (“way; path, track”), Ancient Greek τρᾰ́μῑς (trắmīs, “tharm; gut”), τόρμος (tórmos, “socket; peg”). Doublet of derm.

来源：wiktionary