chorisis

noun
cho·​ri·​sis | \ˈkōrəsə̇s\
plural chorises\-​əˌsēz \

Definition of chorisis 

: the separation of a leaf or floral organ into two or more parts by division during development

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History and Etymology for chorisis

Late Greek chōrisis separation, from Greek chōrizein to separate, from chōris apart

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