1. tuff - Noun
2. tuff - Adjective
3. Tuff - Proper noun
Same as Tufa.
Source: Webster's dictionaryBasaltic tuff Most of the moais in Easter Island are carved out of tholeiite basalt tuff Basaltic tuffs are also of widespread occurrence both in districts where volcanoes are now active and in lands where eruptions have long since ended. Source: Internet
Around the year 200, the wooden walls of the fortification were replaced by sturdier tuff stone walls, citation remnants of which are still to be found below the buildings around Dom Square. Source: Internet
Folding and metamorphism Remains of the ancient Servian Walls in Rome, made of tuff blocks In course of time, other changes than weathering may overtake tuff deposits. Source: Internet
These accessory or adventitious materials, however, as distinguished from the true ashes, tend to occur in angular fragments; and when they form a large part of the mass the rock is more properly a "volcanic breccia " than a tuff. Source: Internet
Basaltic tuff or pyroclastic rocks are rare but not unknown. Source: Internet
For example, the whole port of the island of Ventotene (still in use), was carved out from tuff. Source: Internet