- A friable volcanic rock or conglomerate, formed of consolidated cinders or scoria.
- A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). tufa. Retrieved September 24, 2026, from http://smartdefine.org/tufa/definitions/2075377 |
| Chicago | Webster's. 2011. "tufa" http://smartdefine.org/tufa/definitions/2075377 (accessed September 24, 2026). |
| Harvard | Webster's 2011, tufa, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/tufa/definitions/2075377>. |
| MLA | Webster's. "tufa" 28 May 2011. Web. 24 September 2026. <http://smartdefine.org/tufa/definitions/2075377> |