lunar cycle 
noun
Another term for Metonic cycle.Druids were early astronomers with one of the first accurate calendars based on the eighteen year lunar cycle.
- previous question
- previous to
- previse
- prevision
- previsional
- previsionary
- pre-visualisation
- previsualise
- pre-visualization
- pre-visualize
- previsualize
- previtamin
- prevocalic
- prevocalically
- prevocalized
- pre-vocational
- prevolitional
- prevost
- prevostship
- prevosté
- prevotal
- prevotal court
- prevoyance
- prevôté
- pre-war