calc-tufa calc-spar • calculating machine · · · Info · Definitions · Synonyms · Characters · · calc-tufa · · Text Common · · Latin · · Scripts 9 · · Length Definitions · · · (noun) a soft porous rock consisting of calcium carbonate deposited from springs rich in lime. Synonyms: tufa. · · Noun Definition 1 Synonyms · · · tufa · · Synonym 1 Characters · · - hyphen-minus U+002D a latin small letter a U+0061 c latin small letter c U+0063 f latin small letter f U+0066 l latin small letter l U+006C t latin small letter t U+0074 u latin small letter u U+0075