Etymograph > Indo-European > Old English > Dictionary > þǣsma

N (masc)

Leaven

Source: Ringe 2014:235, https://bosworthtoller.com/31498
originates from: PWGmc *þaisimō "yeast" (þaisimō > þaisimā > þāsimā > þǣsimā > þǣsmā > þǣsma) through pwgmc-to-oe
(source: Ringe 2014:235)