Word Study
tuff
WORDNET DICTIONARY
Noun tuff has 1 sense
- tuff(n = noun.substance) tufa - hard volcanic rock composed of compacted volcanic ash; Array is a kind of volcanic rock
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