noun Botany.
(especially of leaves) increased growth on the upper surface of an organ or part, causing it to bend downward.

1875–80; epi- + Greek nast(ós) pressed close + -y3

epinastic, adjective
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World English Dictionary
epinasty (ˈɛpɪˌnæstɪ)
n , pl -ties
Compare hyponasty increased growth of the upper surface of a plant part, such as a leaf, resulting in a downward bending of the part
[C19: from epi- + -nasty, from Greek nastos pressed down, from nassein to press]

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Example sentences
Low levels of ethylene can result in leaf abscission, epinasty and yellowing.
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