Tuff

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Tuff \Tuff\, n. (Min.)
     Same as {Tufa}.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  tuff
       n : hard volcanic rock composed of compacted volcanic ash [syn:
           {tufa}]