‖Ab′a‐cis″cus (ăb′ȧ‐sĭs″kŭs), n. [Gr. αβακἴσκοσ, dim of ἄβαξ. See Abacus.] (Arch.) One of the tiles or squares of a tessellated pavement; an abaculus.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.