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• nastic
  nastic

  adjective

  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
  -nastic

  a combining form occurring in adjectives corresponding to nouns ending in -nasty:

nastic

¹ American  

[nas-tik] / ˈnæs tɪk /

adjective

Botany.

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.

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-nastic ² American  

1. a combining form occurring in adjectives corresponding to nouns ending in -nasty:

   hyponastic.

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Etymology

Origin of nastic¹

1900–10; < Greek nast ( ós ) pressed close, stamped down, firm (equivalent to nad- stem of nássein to press, squeeze + -tos past participle suffix, with dt > st ) + -ic

Origin of -nastic²

see origin at nastic