Английский разговорный словарь (основной) - abacus
Abacus
abacus
ˈæbəkəs n. (pl. abacuses) 1 an oblongframewith rows of wires or grooves alongwhich beads are slid, used forcalculating. 2 Archit. the flat slab on top of a capital, supporting the architrave. [L f. Gk abax abakos slab, drawing-board, f. Heb. ' abak dust]