WordReference Random House Unabridged Dictionary of American English © 2025
nyc•ti•trop•ic
(nik′ti trop′ik, -trō′pik),USA pronunciation adj. [Bot.]
nyc•tit•ro•pism
(nik ti′trə piz′əm),USA pronunciation n.
- Botanytending to assume at or just before nightfall positions unlike those maintained during the day, as the leaves or flowers of certain plants.
- 1875–80; nycti- + -tropic