tufa /tooˈfə, tūˈfə/

1. Calc-sinter (often calcareous tufa)
2. Tuff or other porous rock (obsolete)

tufāˈceous adjective

• firing line
• firing lines
• firing on all cylinders
• firing order
• firing orders
• firing parties
• firing party
• firing pin
• firing pins
• firing point
• firing points
• firings
• firing squad
• firing squads
• firing-step
• firk
• firked
• firkin
• firking
• firkins
• firks
• firlot
• firlots
• firm
• firmament