起皺,成皺,皺狀
Corrugation \Cor`ru*ga"tion\ (k?r`r?-g?"sh?n), n. [Cf. F. corrugation.] 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