- Main Entry:
- Al·gol

- Pronunciation:
-
\ˈal-ˌgäl, -ˌgȯl\
- Function:
- noun
- Etymology:
- Arabic al-ghūl, literally, the ghoul
- Date:
- 14th century
: a binary star in the constellation Perseus whose larger member orbits and eclipses the smaller brighter star causing periodic variation in brightness