abacus
意味
- そろばん
例文
A calculator is more efficient than an abacus.
電卓は、そろばんよりも効率的だよ。
A "soroban" is a type of Japanese abacus.
算盤とは日本のアバカスのことだ。
I know how to do addition on an abacus.
そろばんの足し算のやり方が分かったよ。
語源
英語の原文（Wiktionary）
From Late Middle English abacus, abagus, agabus (“abacus; art of counting with an abacus”), from Latin abacus, abax (“sideboard or table with a slab at the top; slab at the top of a column; counting board, sand table; board for playing games”) (compare Late Latin abacus (“art of arithmetic”)), from Ancient Greek ἄβαξ (ábax, “slab, counting board; board covered with sand for drawing; plate; dice-board”). Doublet of abaque and abac. The plural form abaci is reinforced from Latin abacī.