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Adjective: corrugated  'kó-ru`gey-tid
  1. Shaped into alternating parallel grooves and ridges
    "the surface of the ocean was rippled and corrugated"
Verb: corrugate  'kó-ru`geyt
  1. Fold into ridges
    "corrugate iron"

See also: corrugation, furrowed, rugged

Type of: fold, fold up, turn up