tuff

不可数

A noun referring to a hard volcanic rock composed of compacted volcanic ash.

• 🇨🇳一种由火山喷发产生的火山灰和岩石碎屑压实固结而成的岩石。也常作为“凝灰岩”的简称。

1. Volcanic rock C1 formal

   A hard, porous rock formed from compacted volcanic ash and other ejected materials.

   • The cliff was composed of layers of tuff from ancient eruptions.
   • Builders used local tuff to construct the old city walls.
   • Geologists studied the tuff deposits to understand the volcano's history.

   🇨🇳凝灰岩

   同义词: tufa