abacus /ˈabəkəs/

a

I. noun

1. a simple device for calculating, consisting of a frame with rows of wires or grooves along which beads are slid.
2.
[Architecture] the flat slab on top of a capital, supporting the architrave.
– origin late Middle English (denoting a board strewn with sand on which to draw figures): from Latin, from Greek abax, abak- ‘slab, drawing board’, of Semitic origin; probably related to Hebrew ‘āḇāq ‘dust’.

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