An Etymological Dictionary of the German Language/Darm
Darm, m., ‘gut, intestine,’ from the equiv. MidHG. darm, OHG. daram, m.; comp. AS. þearm, OFris. therm, Du. darm, OIc. þarmr, m., Swed. and Dan. tarm. Corresponds in the non-Teut. languages to Lat. trâmes, ‘way,’ Gr. τρῆμα, ‘hole, eye,’ τράμις, ‘perineum,’ from root tar, ‘to traverse.’ Hence the orig. sense of Darm was probably ‘passage.’ — Allied to the collective Gedärm (ModHG.), n., ‘entrails,’ from the equiv. MidHG. gederme, OHG. gidermi, n.