Definition of carbons:
(n) :
(uncountable) The chemical element (symbol C) with an atomic number of 6. It can be found in pure form for example as graphite, a black, shiny and very soft material, or diamond, a colourless, transparent, crystalline solid and the hardest known material.
(n) :
(countable) An atom of this element, in reference to a molecule containing it.
(n) :
A fossil fuel that is made of impure carbon such as coal or charcoal.
(n) :
(countable, informal) A carbon copy.
(n) :
(countable, informal) A sheet of carbon paper.
(v) :
(Internet, transitive, uncommon) To send a carbon copy of an email message to.