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BLACK LEAD
I. (noun)
Sense 1
Meaning:
Used as a lubricant and as a moderator in nuclear reactors
Synonyms:
black lead; graphite; plumbago
Classified under:
Hypernyms ("black lead" is a kind of...):
atomic number 6; C; carbon (an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond; occurs in all organic compounds)
Hyponyms (each of the following is a kind of "black lead"):
lead; pencil lead (mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil)
pencil (graphite (or a similar substance) used in such a way as to be a medium of communication)
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