calc-tu·fa 
(kălkt′fə, -ty′-) also calc-tuff (-tŭf′)
(kălkt′fə, -ty′-) also calc-tuff (-tŭf′)n.
Calcareous tufa, a porous or spongy deposit of calcium carbonate found in calcareous mineral springs.
[CALC(AREOUS) + TUFA.]
- (Alfred) Damon
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