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corrugated
Wrinkled or furrowed, as cardboard or iron
Trivia about corrugated
The ridges in this type of heavy carton paper, from the Latin for "wrinkle", are called flutes
(Kelly of the Clue Crew uses paper cups & sheets of paper to demonstrate.) There is little support on one horizontal surface; however, with the load distributed among several vertical surfaces, you get much stronger support when the paper is ridged this way, from the Latin for "wrinkle"