A large earthenware jar or crock (often used for brewing or storing sake); an older term/readings are 'mika' or 'mikawa'.
昔は甕に酒を入れて土中に埋めて保存した。
In the past, sake was stored in jars buried in the ground.
庭から古い甕が発掘された。
An old jar was excavated from the garden.