1. The tendency of certain plant organs, as leaves, to assume special "sleeping" positions or make curl up under the influence of darkness

Derived forms: nyctitropisms

• fluidounce
• fluidram
• fluke
• flukey
• fluky
• flume
• flummery
• flummox
• flump
• flump down
• flunitrazepam
• flunk
• flunkey
• flunky
• fluor
• fluorapatite
• fluoresce
• fluorescein
• fluorescein isocyanate
• fluorescein isothiocyanate
• fluoresceine
• fluorescence
• fluorescence microscopy
• fluorescent
• fluorescent dye