corrugators is corrugator's Plural Form

corrugator

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UK 
  • n.波纹[瓦楞]板轧制机;波纹纸制造工[机];【解】皱眉肌
  • Web皱眉纹
Plural Form:corrugators  
n.
1.
波纹[瓦楞]板轧制机;波纹纸制造工[机];【解】皱眉肌