The adjective corrugated means having similar rows of folds that look like a series of waves when seen from the end.
Synonyms are crumpled, grooved, or ridged.
The word origins from Latin (1620s) corrugatus meaning “bent into curves or folds” and past-participle adjective from corrugate meaning “wrinkled”.
Among the ashes, corrugated roofs were found.
The ceiling is made from pieces of corrugated iron.
The cabin is made with corrugated iron and with sandy ground.