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terra sigillata(ˈtɛrə ˌsɪdʒɪˈlɑːtə)
1. (Geological Science) rare a reddish-brown clayey earth found on the Aegean island of Lemnos: formerly used as an astringent and in the making of earthenware pottery
2. (Geological Science) any similar earth resembling this
3. (Archaeology) earthenware pottery made from this or a similar earth, esp Samian ware
[from Latin: sealed earth]