Jisho

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Noun, Suru verb, Noun which may take the genitive case particle 'no'
1. regression (of cancer); involution (of an organ); atrophy
Wikipedia definition
2. Involution (medicine)Involution of an organ is the shrinking or return to a former size.
Read “Involution (medicine)” on English Wikipedia
Read “退縮” on Japanese Wikipedia
Read “Involution (medicine)” on DBpedia

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