Meaning & use
tuff
Last updated
A porous, lightweight rock formed from compacted volcanic ash.
See it in a sentence
Ancient builders carved entire cave dwellings out of soft volcanic tuff.
Geologists studied the layers of tuff to date the volcano's past eruptions.
A note on using this word
A geology term; don't confuse it with the informal spelling 'tuff' sometimes used for 'tough.'
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