tessera /tesˈə-rə/

1. One of the small pieces of which a mosaic is made
2. A token or ticket made usu of wood or bone (ancient hist)
3. A password. See also tessara-

tessˈeral adjective

1. Of tesserae
2. Cubic, isometric (crystallography)

tessara- or tessera- /tes-ə-rə-/

Denoting four, as in tessˈaraglot, in four languages

tessˈeract noun

(Gr aktis ray) a figure of a cube within a cube

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