Dyas /'daiәs/ 📖 中文释义 [地质]二叠纪, 二叠系 🔗 释义中的汉语词二叠纪二叠系 📘 English Definition(英文释义) n. A name applied in Germany to the Permian formation, thereconsisting of two principal groups. ← dyarchy D 字母词表 dyaster →