tuff /tuf, tŭf/

1. A rock composed of fine volcanic fragments and dust
2. Tufa or other porous rock (obsolete)

tuffāˈceous adjective

• pilot jack
• pilot jacket
• pilot jackets
• pilot jet
• pilot jets
• pilot lamp
• pilot lamps
• pilotless
• pilot light
• pilot lights
• pilotman
• pilotmen
• pilot officer
• pilot officers
• pilot-plant
• pilot-plants
• pilot project
• pilot projects
• pilots
• pilot scheme
• pilot whale
• pilot whales
• pilous
• pilow
• Pils