ˈplastəˌkrän noun
( -s )
Etymology: plasto- + Greek chronos time
: a unit of time corresponding to the interval between two successive similar, periodically repeated events (as the emergence of leaf primordia at any two successive nodes in a stem apex)
• plas·to·chron·ic | ̷ ̷ ̷ ̷|kränik adjective