nyctitropism

noun
nyc·​tit·​ro·​pism | \nikˈti‧trəˌpizəm\
plural -s

Definition of nyctitropism 

: a sleep movement in plants characterized by response to a stimulus that is greatest or exclusively from one direction — compare nyctinasty

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History and Etymology for nyctitropism

International Scientific Vocabulary nyct- + -tropism

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