Meaning of nyctitropic

nyc•ti•trop•ic

Pronunciation: (nik"ti-trop'ik, -trō'pik), [key]
— adj. Bot.
  1. tending to assume at or just before nightfall positions unlike those maintained during the day, as the leaves or flowers of certain plants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.