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:

Nouns denoting substances

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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