Meaning of ABACUS in English

ABACUS

/ ˈæbəkəs; NAmE / noun

( pl. aba·cuses / -kəsɪz; NAmE /) a frame with small balls which slide along wires. It is used as a tool or toy for counting.

••

WORD 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.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.