Hyponasty definitions

hī'pə-năs'tē
The upward bending of a leaf or other plant part, resulting from greater growth of the lower side than of the upper side.
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The condition in which an organ, as a leaf, turns upward because of the more rapid growth of the bottom layers of cells.
noun
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(botany) An upward bending of leaves or other plant parts, caused by increased growth on their lower surface.
noun
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Origin of hyponasty

hypo- +‎ -nasty