An Etymological Dictionary of the German Language/Annotated/Tiegel
Tiegel, masculine, ‘stewpan, crucible,’ from Middle High German tigel, tëgel, Old High German tëgal, ‘crucible’; corresponding to the equivalent Old Icelandic digull (Swedish degel, Danish digel). The cognates cannot have been derived from Latin tegula (yet compare Ziegel). The word is probably based on the Teutonic root dī̆g, ‘to knead, form,’ discussed under Teig.