凝灰岩 — meaning in English

English meaning

• tuff noun A light, porous rock formed from compacted volcanic ash.
• tuft noun A small bunch of hair, grass, feathers, or similar strands bunched together at the base.

Senses

凝灰岩 is used for these senses in English:

• tuff (rock) A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
• tuft A bunch of feathers, grass or hair, etc., held together at the base.

tuft — full definition

1. noun A small bunch of hair, grass, feathers, or similar strands bunched together at the base.
2. verb To secure padding in place with stitched clusters of thread, as in a mattress or cushion.