cor·ru·ga·tion /ˌkɔrəˈgeʃən, ˌkɑr-/
起皺,成皺,皺狀
Cor·ru·ga·tion n. The act corrugating; contraction into wrinkles or alternate ridges and grooves.
◄ ►
corrugation
n 1: a ridge on a corrugated surface
2: the act of shaping into parallel ridges and grooves