| NOUN | substance | black lead, graphite, plumbago | used as a lubricant and as a moderator in nuclear reactors |
|---|
| Meaning | Used as a lubricant and as a moderator in nuclear reactors. | |
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| Synonyms | graphite, plumbago | |
| Narrower | lead, pencil lead | mixture of graphite with clay in different degrees of hardness |
| pencil | graphite (or a similar substance) used in such a way as to be a medium of communication | |
| Broader | carbon, C, atomic number 6 | An abundant nonmetallic tetravalent element occurring in three allotropic forms |
| Spanish | grafito, plombagina, plumbago | |
| Catalan | grafit, plombagina | |
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