plumbago
1. used as a lubricant and as a moderator in nuclear reactors • Syn: graphite, black lead • Hypernyms: carbon, C, atomic number 6 • Hyponyms: lead, pencil lead, pencil 2. any plumbaginaceous plant of the genus Plumbago • Hypernyms: herb, herbaceous plant • Member Holonyms: genus Plumbago
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