from
The Collaborative International Dictionary of English v.0.48
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.
[1913 Webster]
{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.
[1913 Webster]