epinasty

noun
epi·​nas·​ty | \ˈe-pə-ˌna-stē \

Definition of epinasty 

: a nastic movement in which a plant part (such as a flower petal) is bent outward and often downward

First Known Use of epinasty

1880, in the meaning defined above

History and Etymology for epinasty

International Scientific Vocabulary epi- + Greek nastos close-pressed (from nassein to press) + International Scientific Vocabulary -y entry 2

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The first known use of epinasty was in 1880

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