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

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

• apoplexing
• apoplexy
• apoprotein
• apoptoses
• apoptosis
• apoptotic
• aporia
• aporias
• aport
• aposematic
• aposematism
• aposiopeses
• aposiopesis
• aposiopetic
• apositia
• apositias
• apositic
• apospories
• aposporous
• apospory
• apostasies
• apostasy
• apostate
• apostates
• apostatic