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[ep-uh-nas-tee] /ˈɛp əˌnæs ti/
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
Related forms
epinastic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for epinasty
  • Low levels of ethylene can result in leaf abscission, epinasty and yellowing.
British Dictionary definitions for epinasty


noun (pl) -ties
increased growth of the upper surface of a plant part, such as a leaf, resulting in a downward bending of the part Compare hyponasty
Derived Forms
epinastic, adjective
Word Origin
C19: from epi- + -nasty, from Greek nastos pressed down, from nassein to press
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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