Corrugate

kor′oo-gāt, v.t. to wrinkle or draw into folds.— p.adjs. Corr′ugant ; Corr′ugated .— ns. Corrugā′tion , the act of wrinkling or being wrinkled: a wrinkle; Corr′ugator ( an at. ) one of the two muscles that wrinkle the brow.— Corrugated metal , metal pa ed between pairs of rollers with ridged surfaces, the ridges of one fitting into the hollows of the other, the plates operated on being bent and compre ed into the wavy outline of the rolls. [L. cor , inten., rugāre , -ātum , to wrinkle— ruga , a wrinkle.]