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abacus ab′ə kəs  [ab·a·cus]
 
_(type) n., pl. -cuses, -ci (-sī)
1. frame with rows of counters or beads that slide to and fro in grooves or on wires, used in calculating. 2. slab forming the top of a column.
 
1- مِعْدادٌ: أَداةٌ للعَدِّ فيها خَرزاتٌ تُحرَّكُ من جهَةٍ لأُخْرى 2- (بناء) تاجُ عَمودٍ