资料来源 : pyDict

矽石,以矽石所做的石臼

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

Buhrstone \Buhr"stone`\, n. [OE. bur a whetstone for scythes.]
   (Min.)
   A cellular, flinty rock, used for mill stones. [Written also
   {burrstone}.]