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.

Origin of nastic

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


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

Origin of -nastic

see origin at nastic Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for nastic

Historical Examples of nastic