κλίβανος

a clibanus, a earthen vessel for baking bread. It was broader at the bottom than above at the orifice, and when sufficiently heated by a fire kindled within, the dough was baked by being spread upon the outside. [but according to others, the dough was baked by being placed inside and the fire or coals outside, the vessel being perforated with small holes that the heat might better penetrate., a furnace, oven