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Definition of Tuff
1. Noun. Hard volcanic rock composed of compacted volcanic ash.
Definition of Tuff
1. n. Same as Tufa.
Definition of Tuff
1. Noun. (geology) A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. ¹
¹ Source: wiktionary.com
Definition of Tuff
1. a volcanic rock [n -S]
Medical Definition of Tuff
1.