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pencil lead

   Also found in: Legal, Encyclopedia, Wikipedia 0.01 sec.
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Noun1.pencil lead - mixture of graphite with clay in different degrees of hardnesspencil lead - mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
lead
lead pencil - pencil that has graphite as the marking substance
black lead, graphite, plumbago - used as a lubricant and as a moderator in nuclear reactors
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Also it must be noted that both NASA and the Soviets used pencils until 1968, when both sides moved over to using pens because pencil lead could shatter and provide a hazard.
Enemy would expose forgery; YOUR SHOUT by Evening Chronicle (Newcastle, England)
Different stacks don't stick together well, which is why pencil lead is soft.
Pliable carbon by Science News
A total of 139 schools did not open because of the action, including 17 special schools and 11 nursery schools Write stuff: Scientists have shown how pencil lead can be turned into a substance harder than diamond, it was revealed last night.
Britain Today by The Journal (Newcastle, England)
 
 
 
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