Which ancient Greek monster had snakes for hair and a deadly stare?

Medusa is best known for having hair made of snakes and for her ability to turn anyone she looked at to stone, literally to petrify. Multiple works by ancient sources, such as Homer, the eighth-century B.C. poet Hesiod, and the fifth-century B.C. lyric poet Pindar, provide a wide-ranging and diverse picture of the fabled creature.

Source: Met Museum