1. a frame with rows of beads or balls that slide along wires or rods, used for counting and doing arithmetic

Examples

• The children learned to add and subtract using a colorful wooden abacus.
• In ancient times, merchants used an abacus to calculate prices quickly.
• She moved the beads on the abacus to solve the math problem.
• The teacher demonstrated multiplication on a large classroom abacus.
• Many Asian countries still teach basic arithmetic with an abacus.
• He could perform complex calculations faster on an abacus than with a calculator.