tufa

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a soft porous rock consisting of calcium carbonate deposited from springs rich in lime
• Syn:
calc-tufa
• Hypernyms:
rock, stone
2. hard volcanic rock composed of compacted volcanic ash
• Syn:
tuff
• Hypernyms:
volcanic rock

• Từ đồng nghĩa / Synonyms:
  tuff, calc-tufa