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.
- twist-grip
- twist in the wind
- twist-lock
- twistor
- twist (or turn) the knife (in the wound)
- twist (or wind or wrap) someone around one's little finger
- twists and turns
- twist someone around one's little finger
- twist someone's arm
- twist tie
- twisty
- twit
- twitch
- twitcher
- twitch grass
- twitchiness
- twitchy
- twite
- twitten
- Twitterati
- twitterer
- twitterpated
- Twittersphere
- Twitterverse