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

• affinity
• affirm
• affirmable
• affirmation
• affirmative
• affirmative action
• affirmative pleading
• affirmatively
• affirmativeness
• affirmatory
• Affirmed
• affirmer
• affix
• affixal
• affixation
• affixed
• affixial
• afflatus
• afflict
• afflicted
• affliction
• afflictive
• affluence
• affluent
• affluently