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Meaning of nastic

nas•tic

Pronunciation: (nas'tik), [key]
— adj. Bot.
  1. of or showing sufficiently greater cellular force or growth on one side of an axis to change the form or position of the axis.

-nastic

Pronunciation: [key]
  1. a combining form occurring in adjectives corresponding to nouns ending inhyponastic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.