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The Collaborative International Dictionary
Cydonin

Cydonin \Cy*do"nin\ (s?-d?"n?n), n. (Chem.) A peculiar mucilaginous substance extracted from the seeds of the quince ( Cydonia vulgaris), and regarded as a variety of amylose.

Wiktionary
cydonin

n. (context organic compound English) A mucilaginous substance extracted from the seeds of the quince (''Cydonia oblonga''), regarded as a variety of amylose.