An Etymological Dictionary of the German Language/Tiegel
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Tiegel, m., ‘stewpan, crucible,’ from MidHG. tigel, tëgel, OHG. tëgal, ‘crucible’; corresponding to the equiv. OIc. digull (Swed. degel, Dan. digel). The cognates cannot have been derived from Lat. tegula (yet comp. Ziegel). The word is probably based on the Teut. root dī̆g, ‘to knead, form,’ discussed under Teig.