tessera

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tes·ser·a / ˈtesərə/ • n. (pl. tes·se·rae / ˈtesərē/ ) a small block of stone, tile, glass, or other material used in the construction of a mosaic. ∎  (in ancient Greece and Rome) a small tablet of wood or bone used as a token.DERIVATIVES: tes·ser·al / -rəl/ adj.

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