Last Updated：2025/11/20

(petrology) A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.

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tuff

Source Word

tuff

IPA(Pronunciation)

/tʌf/

Noun

countable uncountable

Japanese Meaning

軽い多孔質の岩石。特に、固まった火山灰から成り、細かい砂粒から粗い礫までの大きさの異なる粒子が含まれるもの

The geologist collected samples of tuff from the cliff face to analyze their mineral composition.

地質学者は崖面から凝灰岩の試料を採取して、その鉱物組成を分析した。

Sense（1）

This is what makes an ignimbrite; the general term for this kind of volcaniclastic rock is ‘tuff’.

tuffs

（ plural ）