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

• sea turtles
• sea unicorn
• sea unicorns
• sea urchin
• sea urchins
• sea vampire
• sea vampires
• sea view
• sea views
• sea wall
• sea-walled
• sea walls
• seaward
• seawardly
• seawards
• seaware
• seawares
• sea wasp
• sea wasps
• seawater
• seawaters
• sea wave
• sea waves
• seaway
• seaways