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The Collaborative International Dictionary of English v.0.48:

Abaculus \A*bac"u*lus\ ([.a]b*[a^]k"[-u]*l[u^]s), n.; pl. Abaculi (-l[imac]). [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. [1913 Webster]