Corrugated is a type of material that is characterized by having ridges and grooves. It is made up of multiple layers of paper or cardboard that are glued together and then pressed into a wave-like pattern. The term 'corrugated' can be broken down into several descriptive words, such as FLUTED (6 letters), FURROWED (8 letters), CREASED (7 letters), WRINKLED (8 letters), GROOVED (7 letters), RIDGED (6 letters), matzo (5 letters), and crinkled (8 letters). These words all describe the same material, but from different perspectives.