triduum /tridˈū-əm or trīˈdū-/ (esp RC)

1. A space of three days
2. A period of prayer or religious celebration lasting three days

tridˈūan adjective

Lasting three days

• pill bug
• pill bugs
• pilled
• pillhead
• pillheads
• pillicock
• pillicocks
• pilling
• pillings
• pillion
• pillioned
• pillioning
• pillionist
• pillionists
• pillion-rider
• pillions
• pillion-seat
• pillion-seats
• pilliwinks
• pillock
• pillocks
• pilloried
• pillories
• pillorise
• pillorised