石せき墨ぼく

noun

graphite; black lead

Technical and everyday term for the mineral graphite, used in pencils, lubricants, and industrial applications.

• 鉛えん筆ぴつの芯しんには石せき墨ぼくが使つかわれている。

  Graphite is used in pencil leads.

• 石せき墨ぼくは高こう温おんでも安あん定ていな素そ材ざいだ。

  Graphite is a material that remains stable even at high temperatures.