1. An ancient contrivance still used in elementary schools to teach arithmetical calculations, called also Abacus Pythagoricus; a cupboard or buffet. A table constituting the upper member of crowning of a column and its capital Abacus harmonicus, the structure and disposition of the keys of a musical instrument.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• abucus,
• becus,
• aticus,
• bacuse,
• abious,
• ebacuse,
• abicus,
• nbacks,
• abacas,
• abbacus,
• abackup,
• beacus,
• abous,
• afocus,
• abcks,
• abakus,
• abacaas,
• abaccus,
• abascus,
• zbacus

• abscissa,
• abscise,
• abscess,
• abscessed.

The adjective form of the word "abacus" is "abacus-based".

The plural of the "abacus" can be the "abacuses".

The singular of the "abacus" can be the "abacus".