Meaning of the word "permanent wave" in English

What does "permanent wave" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

permanent wave

US /ˈpɜːrmənənt weɪv/
UK /ˈpɜːmənənt weɪv/

Noun

a chemical treatment that makes hair curly or wavy for a long period of time

Example:
She decided to get a permanent wave to add volume to her straight hair.
My grandmother used to get a permanent wave every few months.