Abacus

Ab′acus

A small frame with wires stretched across it. Each wire contains ten movable balls, which can be shifted backwards or forwards, so as to vary ad libitum the number in two or more blocks. It is used to teach children addition and subtraction. The ancient Greeks and Romans employed it for calculations, and so do the Chinese. The word is derived from the Phoen. abak (dust); the Orientals used tables covered with dust for ciphering and diagrams. In Turkish schools this method is still used for teaching writing. The multiplication table invented by Pythagoras is called Abacus Pythagoricus. (Latin, abacus)

Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894

More on Abacus from Fact Monster:

• abacus, in mathematics - abacus abacus , in mathematics, simple device for performing arithmetic calculations. The type of ...
• abacus, in architecture - abacus abacus , in architecture, flat slab forming the top member of a capital. In classical orders ...
• entablature - entablature entablature , the entire unit of horizontal members above the columns or pilasters in ...
• capital, in architecture - capital capital, in architecture, the crowning member of a column, pilaster, or pier. It acts as ...
• Doric order - Doric order Doric order, earliest of the orders of architecture developed by the Greeks and the one ...