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

• first water
• First World
• first year allowance
• firth
• firths
• fir tree
• fir trees
• firwood
• firwoods
• FIS
• FISA
• fisc
• fiscal
• fiscal cliff
• fiscal cliffs
• fiscal drag
• fiscally
• fiscals
• fiscal year
• fiscal years
• fiscs
• fisgig
• fisgigs
• fish
• fishable