vicennial /vī-senˈyəl/

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

• droshky
• droskies
• drosky
• drosometer
• drosometers
• drosophila
• drosophilas
• dross
• drosses
• drossier
• drossiest
• drossiness
• drossinesses
• drossy
• drostdies
• drostdy
• drostdys
• drought
• droughtier
• droughtiest
• droughtiness
• droughtinesses
• droughts
• droughty
• drouk