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epinasty

[ep-uh-nas-tee]
noun Botany.
  1. (especially of leaves) increased growth on the upper surface of an organ or part, causing it to bend downward.
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Origin of epinasty

1875–80; epi- + Greek nast(ós) pressed close + -y3
Related formsep·i·nas·tic, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for epinasty

Historical Examples of epinasty

  • Young leaves exhibit moreover a pronounced hyponasty or epinasty, which would naturally modify the diurnal curve.

    Life Movements in Plants, Volume II, 1919

    Sir Jagadis Chunder Bose


British Dictionary definitions for epinasty

epinasty

noun plural -ties
  1. increased growth of the upper surface of a plant part, such as a leaf, resulting in a downward bending of the partCompare hyponasty
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Derived Formsepinastic, adjective

Word Origin for epinasty

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012