abacus

Part of speech: noun

A reckoning- table with sliding balls.

Part of speech: noun

A slab forming the top of a capital.

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Usage examples "abacus":

  1. The roof is sometimes supported by columns, having capitals decorated with designs of flowers or of geese hung from the abacus by their feet with their heads turned upwards. - "History Of Egypt, Chaldæa, Syria, Babylonia, and Assyria, Volume 5 (of 12)", G. Maspero.