‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.