bortz

n. [矿]圆粒金刚钻

别名

boart bort

释义与例句

n.
  1. 1.

    Diamond of inferior quality, commonly used for drill tips; abrasive diamond powder; bort.

    不可数

    1906 September, X-Rays and a Diamond Thief, Popular Mechanics, page 932, It is also noticeable that the black diamond, No. 20, a dull and lusterless substance, is as transparent to the X-rays as the brilliants, while the diamond bortz, No. 6, is much less transparent than either, though more so than the imitation, No 19.