tuff (t f)n. A rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel. Also called tufa. [French tuf, from Old French, from Old Italian tufo, tufa; see tufa.] tuff·a  ceous (t-f sh s) adj. |
tuff [tʌf]
n
(Earth Sciences / Geological Science) a rock formed by the fusing together on the ground of small rock fragments (less than 2 mm across) ejected from a volcano
[from Old French tuf, from Italian tufo; see tufa]
tuffaceous [tʌˈfeɪʃəs] adj
| tuff (tf) A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel. |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. |  tuff - hard volcanic rock composed of compacted volcanic ashvolcanic rock - extrusive igneous rock solidified near or on the surface of the Earth |
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