Having a surface shaped into alternating ridges and grooves, creating a wavy or fluted pattern that increases strength and flexibility.
From Latin 'corrugatus', past participle of 'corrugare' meaning 'to wrinkle', from 'com-' (together) + 'rugare' (to wrinkle). First used in English in the 1620s, later applied to industrial materials in the 1800s.
The corrugated pattern is a marvel of engineering - those simple waves can make cardboard incredibly strong while using minimal material. This same principle appears in nature, from leaf structures to brain tissue, proving that wrinkles aren't always a sign of weakness.
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