Nastic is a 6 letter English word. It's valid Scrabble word worth 8 points. It's valid Words with friends word worth 10 points.
You can make 147 anagrams from letters in nastic (acinst).
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
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.
There is no line of demarcation between tropic and nastic movements.