Abacus

Webster's Condensed Dictionary- A Condensed Dictionary of the English Language · 1909 · p. 18

ab'a-kus, n. A calculating-frame with counters, for computing. (Arch.) The up- CCCOCCCCCper plate upon the capital of a column, sup- -oeoooooec porting the architrave. [L.] — Ab'acist. n. One who computes bv an abacus. Abacus.