You are correct!
From our dictionary:
1. a prehistoric cave dweller.
2. a person of degraded, primitive, or brutal character.
3. a person living in seclusion.
4. a person unacquainted with affairs of the world.
5. an animal living underground.
About Infoplease, Part of Family Education Network
© 2000–2015 Pearson Education, publishing as Infoplease