cor ‧ ru ‧ gated /ˈkɒrəɡeɪtəd, ˈkɒrəɡeɪtɪd $ ˈkɔː-, ˈkɑː-/ BrE AmE adjective
[ Date: 1600-1700 ; Language: Latin ; Origin: past participle of corrugare , from com- ( ⇨ COM- ) + ruga 'line in a surface, wrinkle' ]
in the shape of waves or folds, or made like this in order to give something strength:
corrugated cardboard