nyctinasty

World English Dictionary
nyctinasty (ˈnɪktɪˌnæstɪ)
 
n
botany a nastic movement, such as the closing of petals, that occurs in response to the alternation of day and night
 
[C20: from Greek nukt-, nux night + -nasty]
 
nycti'nastic
 
adj

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