"Tuff" is a word in ENGLISH

See under Calcite.

A variety of opal occuring in the cavities of volcanic tufa, in smooth and shining globular and botryoidal masses, having …

A cellular calc tufa, which in some places forms incrustations on the stems of plants, -- formerly supposed to have …

A calcareous tufa, in part crystalline, occurring on a large scale as a shore deposit about the Quaternary lake basins …

Tufa. See under Tufa, and Toph.

Calcareous tufa.

A white to gray volcanic tufa, formed of decomposed trachytic cinders; -- sometimes used as a cement. Hence, a coarse …

A soft or porous stone formed by depositions from water, usually calcareous; -- called also calcareous tufa.

A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.

Pertaining to tufa; consisting of, or resembling, tufa.

Produced by a volcano, or, more generally, by igneous agencies; as, volcanic tufa.