Nastic Definition
năstĭk
adjective
Designating, of, or exhibiting movement or change in position of a plant or its parts, as in the opening and closing of flowers, in response to a stimulus but independent of the direction of the stimulus and caused by unequal growth of certain cells, changes in light intensity, etc.
Webster's New World
affix
Nastic by some (specified) means or in some (specified) direction.
Epinastic, hyponastic.
Webster's New World
Origin of Nastic
Greek nastos pressed close (from nassein to press) –ic
From American Heritage Dictionary of the English Language, 5th Edition
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