1. A tough, silicified limestone formerly used to make millstones. It is typified by the presence of multiple cavities that originally housed fossilized shells. 
   磨石，砂质多孔石灰岩一种坚硬的，硅化石灰石，以前用来制作磨石。具有最初由化石化的贝壳而形成的多孔特征
2. A small round calcareous grain found, for example, in limestones. 
   鲕粒岩含有圆形小颗粒的石灰质岩石，如在石灰岩中
3. Limestone cliffs; limestone walls. 
   石灰岩峭壁；石灰岩墙
4. a lightweight material in cellular form; made by introducing gas bubbles during manufacture. 
   一种轻质的多孔材料，制造过程中加入了气泡。
5. A structure or part that is porous. 
   多孔部分或多孔结构

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• 1. buhrstone
  buhr || 硅质磨石,细砂质磨石...buhrstone || 砂质多孔石灰岩...BUIC || Backup Interceptor Control (美国空军)后援截击机控制系统
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