資料來源 : Webster's Revised Unabridged Dictionary (1913)

Epinastic \Ep`i*nas"tic\, a. [Pref. epi- + Gr. ? pressed close.]
   (Physiol.)
   A term applied to that phase of vegetable growth in which an
   organ grows more rapidly on its upper than on its under
   surface. See {Hyponastic}.