trisagion /tri-sagˈi-on/

1. An ancient hymn consisting of the words ‘O Holy God, holy and mighty, holy and immortal, have mercy on us’
2. Loosely, the Tersanctus

• acuminates
• acuminating
• acumination
• acuminations
• archaeopteryxes
• Archaeornithes
• archaeozoologist
• archaeozoologists
• archaeozoology
• arthroscope
• arthroscopes
• arthroscopic
• arthroscopies
• arthroscopy
• arthroses
• arthrosis
• arthrospore
• arthrospores
• Arthurian
• Arthuriana
• artic
• artichoke
• artichokes
• article
• articled