hyponastic
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hy·po·nas·ty
(hī′pə-năs′tē)n.
The upward bending of a leaf or other plant part, resulting from greater growth of the lower side than of the upper side.
hy′po·nas′tic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.