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