Algol Syllabification: (Al·gol)Pronunciation: /ˈalˌgôl, -ˌgäl/ AstronomyDefinition of Algol a variable star or star system in the constellation Perseus, regarded as the prototype of eclipsing binary stars. Origin:from Arabic al ġūl 'the ghoul'Algol in other Oxford dictionaries Definition of Algol in the British & World English dictionary