abaciscus
n. countablen. a small, square tile or stone used to make a mosaic pattern. You find these in old buildings or art on floors and walls.
n. a small square stone or tile used in the construction of mosaic pavements or decorative panels. Often used as a synonym for tessera in architectural and archaeological contexts.
The artist carefully placed each abaciscus to finish the pattern.
Archaeologists recovered several abaciscus fragments from the villa floor, suggesting the room once featured a complex geometric mosaic.
The preservation of the Roman bathhouse was remarkable, with every abaciscus in the central medallion remaining perfectly aligned despite centuries of environmental pressure and soil shifting.
From New Latin, from Ancient Greek ἀβακίσκος (abakískos, “a coloured stone for laying mosaic”), diminutive of ἄβαξ (ábax, “board”). See abacus.
Primarily used in technical descriptions of ancient architecture or classical art history.