abacus (instrument for performing arithmetical calculations by sliding balls on wires, or counters in grooves)
Learned borrowing from Latin abacus (“board”), from Ancient Greek ἄβαξ (ábax, “board”), from Hebrew אבק (abák, “dust”).
Ćwicz mówienie i zapamiętywanie " ábaco " i wielu innych słów i zdań z portugalski .