Etymology
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corrugated (adj.)

1620s, "wrinkled" (of skin, etc.), past-participle adjective from corrugate (q.v.). The earlier adjective was simply corrugate (early 15c.), from Latin corrugatus. Meaning "bent into curves or folds" (of iron, cardboard, etc., for elasticity and strength) is from 1853.

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Definitions of corrugated

corrugated (adj.)
shaped into alternating parallel grooves and ridges;
the surface of the ocean was rippled and corrugated
From wordnet.princeton.edu