What is "ptous"

In Greek mythology, Ptous was the eponym of Mount Ptous in Boeotia on which the town Acraephnium was situated. He was believed to have been a son of either Athamas and Themisto, or of Acraepheus and Euxippe, or of Apollo and Zeuxippe, a daughter of Athamas.

Ptous was also an epithet of Apollo, under which the god was honored in a temple near Acraephnium. The epithet was believed to be linked to the name of the above Ptous as well.