Definition of "corrugation" []

• The act or process of corrugating. (noun)
• The state of being corrugated. (noun)
• A groove or ridge on a corrugated surface. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Slabs of sandstone and shale often retain what is called the ripple-mark -- that is, the corrugation of surface produced by the gentle agitation of shallow water over sand or mud."
• "A wave message of light and color, a molecular agitation and integration, a certain minute though definite corrugation in a brain recess, -- and there it was, a picture complete!"
• ""I began experimenting with making a laptop bag in cardboard, and after alternating the direction of the corrugation I constructed something that could take the force of the blow.""