- a star of the second magnitude in the constellation Perseus: the first known and most famous eclipsing binary star.
Origin of Algol
- a computer language in which information is expressed in algebraic notation and according to the rules of Boolean algebra.
Origin of ALGOL
Examples from the Web for algol
Every third night Algol has its light reduced for several hours.The Outline of Science, Vol. 1 (of 4)
J. Arthur Thomson
The most easterly one is β Persei, known as Algol, the famous variable.
Algenib and Algol form with γ Andromedæ, a right-angled triangle.
Mention has been made of a slight irregularity in Algol's period of variation.Pleasures of the telescope
It is to the second of these types that Algol is supposed to belong.Astronomy of To-day
Cecil G. Dolmage
- the second brightest star in Perseus, the first known eclipsing binary. Visual magnitude: 2.2–3.5; period: 68.8 hours; spectral type (brighter component): B8V
- a computer programming language designed for mathematical and scientific purposes; a high-level language
Word Origin and History for algol
Beta Persei, variable star in the constellation Perseus, late 14c., literally "the Demon," from Arabic al-ghul "the demon" (see ghoul). It corresponds, in modern representations of the constellation, to the gorgon's head Perseus is holding, but it probably was so called because it visibly varies in brightness every three days, which sets it apart from other bright stars. The computer language (1959) is a contraction of algo(rithmic) l(anguage); see algorithm.