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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 tuff /ˈtʌf/
 凝灰岩(a.)第一流的

From: Webster's Revised Unabridged Dictionary (1913)

 Tuff n. Min. Same as Tufa.
 

From: WordNet (r) 2.0

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