cor·ru·gat·ed 
/ˈkorəˌgeɪtəd/ adjective
/ˈkorəˌgeɪtəd/ adjective : having a wavy surface — used to describe thin sheets of material (such as metal or cardboard) that have a surface in which there are many folds that look like a series of waves ▪ Their house had a dirt floor and a corrugated metal roof. ▪ corrugated boxes = boxes made out of corrugated cardboard
