Corrugate \Cor"ru*gate\ (-g?t), v. t. [imp. & p. p. Corrugated (-g?`t?d); p. pr. & vb. n. Corrugating (-g?`t?ng).]

To form or shape into wrinkles or folds, or alternate ridges and grooves, as by drawing, contraction, pressure, bending, or otherwise; to wrinkle; to purse up; as, to corrugate plates of iron; to corrugate the forehead.

Corrugated iron, sheet iron bent into a series of alternate ridges and grooves in parallel lines, giving it greater stiffness.

Corrugated paper, a thick, coarse paper corrugated in order to give it elasticity. It is used as a wrapping material for fragile articles, as bottles.

Source: Webster's Revised Unabridged Dictionary (1913)