abaciscus
nounUS /ˌæb.əˈsɪs.kəs/
Etymology From New Latin, from Ancient Greek ἀβακίσκος (abakískos, “a coloured stone for laying mosaic”), diminutive of ἄβαξ (ábax, “board”). See abacus.
1
Archaic One of the tiles or squares of a tessellated pavement; an abaculus.