nastic

[ nas-tik ]

/ ˈnæs tɪk /

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adjective Botany.

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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IS and ARE are both forms of which verb?

have

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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

Other definitions for nastic (2 of 2)

-nastic

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

Origin of -nastic

see origin at nastic

How to use nastic in a sentence

There is no line of demarcation between tropic and nastic movements.
Life Movements in Plants, Volume II, 1919|Sir Jagadis Chunder Bose
Moreover, the tropic action of unilateral light may become nastic by internal diffusion of excitation.
Life Movements in Plants, Volume II, 1919|Sir Jagadis Chunder Bose
The employment of the term 'nastic' is, however, convenient when used in a well-defined and restricted sense.
Life Movements in Plants, Volume II, 1919|Sir Jagadis Chunder Bose
No sharp distinction can therefore be made between the movements of growth and of variation, between tropic and nastic curvatures.
Life Movements in Plants, Volume II, 1919|Sir Jagadis Chunder Bose

I have already referred to the distinction that is made between nastic and paratonic movements.
Life Movements in Plants, Volume II, 1919|Sir Jagadis Chunder Bose