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

• firelight
• firelighter
• firelighters
• firelights
• firelock
• firelocks
• fireman
• fireman's lift
• firemark
• firemarks
• fire-marshal
• fire-marshals
• fire-master
• fire-masters
• firemen
• fire-new
• fire off
• fire-office
• fire-offices
• fire opal
• fire opals
• fire out
• firepan
• firepans
• fireplace