Meaning of CORRUGATED in English

CORRUGATED

[adjective] [not gradable] - (esp. of sheets of iron and cardboard) having parallel rows of folds which look like a series of waves when seen from the edgeThe roof is made from sheets of corrugated iron.Boxes made from corrugated cardboard are light and surprisingly strong.

Cambridge English vocab.      Кембриджский английский словарь.