vicennial /vī-senˈyəl/

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

• curdiness
• curdinesses
• curding
• curdle
• curdled
• curdler
• curdlers
• curdles
• curdling
• curds
• curdy
• cure
• cure-all
• cure-alls
• cured
• cureless
• curer
• curers
• cures
• curet
• curets
• curettage
• curettages
• curette
• condisciples