- a blue-grey sandstone containing much clay, used for building and paving
- the blue crystalline form of copper sulphate
单词 | bluestone |
释义 | WordReference Random House Unabridged Dictionary of American English © 2024 blue•stone (blo̅o̅′stōn′),USA pronunciation n.
Collins Concise English Dictionary © HarperCollins Publishers:: bluestone /ˈbluːˌstəʊn/ n
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