Wordnet 3.0
NOUN (1)
1. 
 a series of waves in the hair made by applying heat and chemicals; 
[syn: permanent wave, permanent, perm]
The Collaborative International Dictionary of English v.0.48:
permanent wave \permanent wave\ n.
   1. A wave or curl in the hair that lasts for months and is
      made durable by treating the hair with chemicals when it
      is curled.
   Syn: permanent.
        [PJC]
   2. The process of treating the hair with chemicals to create
      a permanent wave[1].
      [PJC]
WordNet (r) 3.0 (2006):
permanent wave
    n 1: a series of waves in the hair made by applying heat and
         chemicals [syn: permanent wave, permanent, perm]