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{%type%} Definitions

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Short "hint"

A frame with groups of beads that slide back and forth on wires: it is used for doing arithmetic quickly without writing.

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Usage examples (39)
  • An abacus can be used to add, subtract, multiply, or divide.
  • The columns of these pillared porches have sixteen flutings, a plain abacus, and no plinth.
  • Thus the fourth column from the west is his, and perhaps the fifth up to the abacus, which is convex and of limestone.
  • For a lesson in arithmetic, Brad assembled a kind of abacus out of colored blocks, astounding his teacher.
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