1800Henry Epit. Chem. (1808) 364 The same skilful analyst has found potash in Hungarian pearl-stone.
1852Th. Ross Humboldt's Trav. I. ii. 102, I consider even the pearlstone as an unvitrified obsidian.
英语词典包含277258条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。