Dictionary  ab•a•cusPronunciation: (ab'u-kus, u-bak'us), [key] —n., —pl. ab•a•cus•es, ab•a•ciPronunciation: (ab'u-sī", -kī", u-bak'ī). [key] 1. a device for making arithmetic calculations, consisting of a frame set with rods on which balls or beads are moved. 2. Archit. a slab forming the top of the capital of a column. See diag. under column. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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