Etymology
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tufa (n.)

type of porous rock, 1770, from Italian tufa "tufa, porous rock," probably from Latin tufus, tophus "loose, porous volcanic rock," said to be an Oscan-Umbrian loan-word. Related: Tufaceous.

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Definitions of tufa

tufa (n.)
a soft porous rock consisting of calcium carbonate deposited from springs rich in lime;
Synonyms: calc-tufa
tufa (n.)
hard volcanic rock composed of compacted volcanic ash;
Synonyms: tuff
From wordnet.princeton.edu