saggar

/ˈsæɡər/
noun
  1. A box made of fire-resistant clay, used to protect pottery or ceramics while they are being fired in a kiln.
    • The potter carefully placed the delicate vase inside a saggar before putting it in the kiln.
    • In the ceramics workshop, students learned how to stack saggars to maximize the kiln's space.
    • The museum displayed an ancient saggar that had been used in a medieval pottery factory.
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