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

• prepossessing
• prepossession
• preposterous
• preposterously
• prepotency
• prepotent
• preppie
• preppy
• preprandial
• preprint
• prepubertal
• prepuberty
• prepubescent
• prepuce
• prepupal
• preputial
• prepyloric vein
• prequel
• prerecord
• prerecorded
• prerequisite
• prerogative
• Pres Young
• Pres.
• presage