abacus
noun/ˈæbəkəs/
/ˈæbəkəs/
(plural abacuses
/ˈæbəkəsɪz/
/ˈæbəkəsɪz/
)- a frame with small balls that slide along wires. It is used as a tool or toy for counting.Word Originlate 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 'āb̲āq ‘dust’.
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abacus