资料来源 : pyDict

硫酸铜,青石

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Bluestone \Blue"stone`\, n.
   1. Blue vitriol. --Dunglison.

   2. A grayish blue building stone, as that commonly used in
      the eastern United States.

资料来源 : WordNet®

bluestone
     n : bluish-gray sandstone used for paving and building