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Longman Dictionary of Contemporary English
permanent wave
noun
EXAMPLES FROM CORPUS
▪ A Antibiotics in your system can affect a permanent wave, giving poor or no results at all.
▪ The new space has been gradually transformed from a place of permanent wave to culinary rave.
▪ The same narrow, lined face, the same grey eyes, the same grey hair with the same permanent wave.
Wiktionary
permanent wave

n. 1 (context British English) A series of waves in the hair produced by means of chemical substances and heat; a perm 2 (context physics English) A wave in a moving fluid that does not change shape or position relative to the fluid

WordNet
permanent wave

n. a series of waves in the hair made by applying heat and chemicals [syn: permanent, perm]

Wikipedia
Permanent Wave (album)

Permanent Wave is an album by American musician John Hartford and Doug and Rodney Dillard of The Dillards, released in 1980 (see 1980 in music).

Permanent Wave was reissued on CD in 1992 along with Glitter Grass from the Nashwood Hollyville Strings on the Flying Fish label.