- 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
- a combining form occurring in adjectives corresponding to nouns ending in -nasty: hyponastic.
Origin of -nastic
see origin at nastic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nastic
There is no line of demarcation between tropic and nastic movements.
The employment of the term 'nastic' is, however, convenient when used in a well-defined and restricted sense.
No sharp distinction can therefore be made between the movements of growth and of variation, between tropic and nastic curvatures.