[mass noun] A light porous (especially brown) volcanic rock formed of small grains of sand, cinders, etc.
- ‘Built of uniformly gray, granular volcanic tufa, or peperino, the courtyard was completed by 1579, as recorded in the building documents.’
- ‘They played up the contrast between plastered surfaces and the peperino stone in the footings, projecting windowsills, and coping.’
- ‘Peperino tuff is best known as building stone heavily utilized by the ancient Romans.’
- ‘Peperino shows a brilliant ruby red color and nuances of ruby red, moderate transparency.’
17th century: Italian, from pepere pepper on account of its grainy appearance.