This noun refers to a covered earthen baking vessel or oven, wider at the bottom than the top, used for baking bread by surrounding it with hot embers. Jesus uses it in both Matthew 6:30 and Luke 12:28 in His teaching about God's care: if God so clothes the grass of the field, which today is alive and tomorrow is thrown into the oven, will He not much more clothe you? The image evokes the practice of using dried grass and field plants as fuel for heating bread ovens. The term emphasizes the common, humble household technology that every hearer would recognize from daily life.