Etymograph > Indo-European > Proto-Germanic > Dictionary > *þaismjan-

N (m)

sourdough

Source: Kroonen 2013:531
Words originating from this one
OE þǣsma "sourdough" (þaismjan- > þāsmjan > þǣsmjan > þǣsman) through pgmc-to-oe
(source: Kroonen 2013:531)