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volcanic tuff

noun
1.
tuff2 .
Origin
1805-1815
1805-15
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for volcanic tuff
  • On the steep flanks of volcanic tuff are mounds of yellow buckwheat, many varieties of penstemon, and purple sage.

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