[tuhf] 
[tuhf] | a fragmental rock consisting of the smaller kinds of volcanic detritus, as ash or cinder, usually more or less stratified. |
| tuff (tŭf) 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 (tŭ-fā'shəs) adj. |
| tuff (tŭf) Pronunciation Key
A rock made up of particles of volcanic ash, varying in size from fine sand to coarse gravel. |
