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nyctinasty

/ˈnɪktɪˌnæstɪ/
noun
1.
(botany) a nastic movement, such as the closing of petals, that occurs in response to the alternation of day and night
Derived Forms
nyctinastic, adjective
Word Origin
C20: from Greek nukt-, nux night + -nasty
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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