vicennial /vī-senˈyəl/

1. Lasting, or coming at the end of, twenty years
2. Occurring every twenty years

• cherry pickers
• cherry-picking
• cherry-picks
• cherry-pie
• cherry-pies
• cherry-pit
• cherry-pits
• cherry plum
• cherry plums
• cherry-stone
• cherry-stones
• cherry tomato
• cherry tomatoes
• chersonese
• chersoneses
• chert
• chertier
• chertiest
• cherts
• cherty
• cherub
• cherubic
• cherubical
• cherubically
• cherubim