TUFF

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

Hard volcanic rock composed of compacted volcanic ash

Synonyms:

tufa; tuff

Classified under:

Nouns denoting substances

Hypernyms ("tuff" is a kind of...):

volcanic rock (extrusive igneous rock solidified near or on the surface of the Earth)

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