Abaculus
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A`bac´u`lus
(åb`ăk´ũ`lŭs)n. | 1. | (Arch.) A small tile of glass, marble, or other substance, of various colors, used in making ornamental patterns in mosaic pavements. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.