tuff

 : 
Noun

WORDNET DICTIONARY

Noun tuff has 1 sense

CIDE DICTIONARY

tuffn. 
     Same as Tufa.  [1913 Webster]

OXFORD DICTIONARY

tuff, n. rock formed by the consolidation of volcanic ash.

Derivative
tuffaceous adj.
Etymology
F tuf, tuffe f. It. tufo f. LL tofus, L TOPHUS

For further exploring for "tuff" in Webster Dictionary Online


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