石せき墨ぼくせきぼくじ字FuriganaMeanings1noungraphite; black leadTechnical 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.
