What does corrugation mean?
Corrugation refers to a ridge or groove, particularly one member of a regular series of parallel folds worked into a flat material or surface. It also names the process of creating those ridges and grooves. The word appears most often in practical and technical contexts: corrugated iron and steel are thin metal sheets strengthened by wave-like corrugations, corrugated cardboard owes its cushioning rigidity to fluted inner layers, and unpaved roads develop washboard-like corrugations under repeated traffic. Beyond engineering, the word describes natural wrinkling or rippling, as in the corrugations of skin, sand, or fabric. Its connotations are neutral and descriptive rather than emotional, giving it a precise, slightly formal flavor that suits scientific and trade writing. Derived from the Latin verb corrugare, meaning 'to wrinkle together', corrugation is a useful word whenever a surface's ridged texture matters more than its color or substance.
nounA ridge or groove, especially one of a regular series formed in a material or surface; the act or process of shaping something into such ridges and grooves.
- A ridge or groove in a surface, especially one of a regular parallel series (as in corrugated iron or cardboard)
- The process or result of forming such ridges and grooves; a wrinkling or rippling of a surface
"The old dirt road was marked by deep corrugations left by years of heavy trucks."
"The shed's walls were built from sheets of iron whose corrugations added remarkable stiffness to the thin metal."
"With age, fine corrugations appeared across the once-smooth leather of the armchair."
The plural typically refers to multiple individual ridges or grooves, as in the washboard corrugations of a dirt road.
"Deep corrugations ran across the unpaved track after a season of heavy vehicles."
Corrugated iron, patented in 1829, is one of the few building materials whose strength comes not from thickness but from its wavy shape.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of corrugation
Corrugation derives from the Latin verb corrugare, meaning 'to wrinkle' or 'to fold into wrinkles', formed from com- ('together') and ruga ('a wrinkle'). English took the word via Late Latin corrugatio, with the noun appearing in English around the early seventeenth century alongside the verb corrugate. It shares its root with ruga-based relatives such as 'rugose', a chiefly biological term for a wrinkled surface.
Related word forms
How corrugation is actually used
Mostly technical or descriptive register, common in construction, engineering, and geology contexts. The plural 'corrugations' often denotes the individual ridges themselves, while the singular can refer either to one ridge or to the general condition of being corrugated. In road contexts, 'corrugations' is a standard term for the washboard-like ripples that develop on unpaved surfaces.
Easily confused with corrugation
Congregation means an assembled group of people (or animals); corrugation refers to ridges and grooves, despite their similar sound and spelling.