ABACULUS
Source: 567
‖A‐bac″u‐lus (ȧb‐ăk″ū̍‐lŭs), n.; pl. Abaculi (–lī). [[L., dim. of abacus.]] (Arch.) A small tile of glass, marble, or other substance, of various colors, used in making ornamental patterns in mosaic pavements. Fairholt.
Source: 567
‖A‐bac″u‐lus (ȧb‐ăk″ū̍‐lŭs), n.; pl. Abaculi (–lī). [[L., dim. of abacus.]] (Arch.) A small tile of glass, marble, or other substance, of various colors, used in making ornamental patterns in mosaic pavements. Fairholt.