corrugated

Corrugated means molded into tight ridges and valleys. You've probably seen corrugated cardboard or corrugated metal roofs.

Materials are put into a corrugated shape to ensure elasticity and strength — cardboard boxes hold their shape because the cardboard is reinforced with a corrugated layer inside the two flat pieces. To remember corrugated, think about corduroy pants — which also have ridges and valleys. If you're lucky enough to have had ribbon candy, that's corrugated as well.

Definitions of corrugated
1

adj shaped into alternating parallel grooves and ridges

“the surface of the ocean was rippled and corrugated
Synonyms:
furrowed, rugged
having long narrow shallow depressions (as grooves or wrinkles) in the surface

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