The vessel in which the dough, after being mixed and leavened, was left to swell or ferment (Ex. 8:3; 12:34; Deut. 28:5, 7). The dough in the vessels at the time of the Exodus was still unleavened, because the people were compelled to withdraw in haste.
Easton’s Bible Dictionary
Kneading-trough
Easton’s Bible Dictionary (1897), public domain. Text via Theographic Bible Metadata, CC BY-SA 4.0.