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

• wash-hand basin
• wash-hand stand
• washable
• washables
• washbag
• washbasin
• washboard
• washbowl
• washcloth
• washday
• washed
• washed-out
• washed-up
• washer
• washerman
• washerwoman
• washhouse
• washing
• washing day
• washing machine
• washing powder
• washing soda
• washing-up
• washing-up liquid
• Washington