Jisho

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Noun, Suru verb, Intransitive verb
1. bend; geologic fold
Wikipedia definition
2. Fold (geology)The term fold is used in geology when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved as a result of permanent deformation. Synsedimentary folds are those due to slumping of sedimentary material before it is lithified. Folds in rocks vary in size from microscopic crinkles to mountain-sized folds. They occur singly as isolated folds and in extensive fold trains of different sizes, on a variety of scales.
Read “Fold (geology)” on English Wikipedia
Read “褶曲” on Japanese Wikipedia
Read “Fold (geology)” on DBpedia
Other forms
皺曲 【しゅうきょく】

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