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Glite Dictionary
black lead

black lead

8.6
A soft black material in pencil cores that is also used as a nuclear reactor moderator called graphite
  • noun
  • /blæk lɛd/
  • Archaic
translation icon : grafito
  • The mechanic used black lead to lubricate the moving parts of the engine.

Examples

  • If you write on paper, use the one with black lead.

    Teddy (2025)

  • Surely this would have come with a black lead or maybe a charcoal colored lead.

  • And if I was to go to Diotest and put the red lead on the drain, the black lead on the source, you can see we're getting a reading.

  • When drawing, artists often prefer using a pencil filled with black lead for its smooth application.

  • In nuclear reactors, black lead acts as a moderator, helping to control the rate of fission.

Synonyms

graphite
vsblack lead
  • Specialized
22 3.9

A soft black material used in pencils and to make things move smoothly

is the traditional name for this material emphasizing its soft black form
plumbago
vsblack lead
  • Archaic
9.9

A form of graphite used to lubricate machines and slow reactions in nuclear reactors

is the general term for the same substance rather than a specific form

Surface Forms

black lead singular
black leads plural

Morphology

black + lead

The meaning is a straightforward adjective + noun composition: 'black' (colour) + 'lead' (here = pencil core/graphite) yields 'black form of lead/graphite', which a learner can derive from the parts. This follows a regular English modifier+head pattern and would be clear to a B1 learner who knows 'lead' in the pencil/core sense (context such as 'pencil' disambiguates from the metal).

Etymology

Black lead comes from when people saw a dark, soft mineral and called it black lead because it looked like real lead. People used this dark material in 'pencils' and to grease machines, so the name black lead stuck and now means the soft carbon we call 'graphite'.