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.]
- biolith
- biolithic
- biologic
- biologic
- biological
- biological clock
- biological computing
- biological control
- biological drug
- biological half-life
- biologically
- biological oxygen demand
- biological response modifier
- biological warfare
- biological weapon
- biologist
- biology
- bioluminescence
- bioluminescent
- biolysis
- biolytic
- biomagnetism
- biomagnification
- biomarker
- biomass