corrugation
/ˌkɔɹ.əˈɡeɪ.ʃən/
noun 2
Definitions
noun
1
The process of corrugating; contraction into wrinkles or alternate ridges and grooves.
According to the pilot, ships were taking hard punishment in the storm. But from this altitude the corrugations of the seas looked no higher to the eye than the ridges of your palate feel to the tongue.
2
washboarding (the appearance of ripples or bumps on a dirt or gravel road)
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