opus sectile
/ˌəʊpəs ˈsɛktɪleɪ/Archaeol.
noun
A form of Roman floor decoration similar to mosaic but composed of pieces shaped individually to fit the design, rather than regularly shaped tesserae.
Origin
Mid 19th century. From classical Latin opus work + sectile, neuter of sectilis produced by cutting, used by Vitruvius of Roman floors.
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