1. A soft porous rock consisting of calcium carbonate deposited from springs rich in lime
   - calc-tufa 
2. Hard volcanic rock composed of compacted volcanic ash
   - tuff

Derived forms: tufas

Type of: rock, stone, volcanic rock

Encyclopedia: Tufa

• Ruth Benedict
• Ruth Fulton
• Ruth Saint Denis
• Ruth St. Denis
• ruthenium
• rutherford
• Rutherford atom
• Rutherford B. Hayes
• Rutherford Birchard Hayes
• rutherfordium
• ruthful
• ruthfulness
• ruthless
• ruthlessly
• ruthlessness
• rutilant
• rutile
• Rutilus
• Rutilus rutilus
• rutin
• Rutland
• Rutledge
• rutted
• rutter
• ruttish