"carbons" in the noun sense
1. carbon, C, atomic number 6
an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond occurs in all organic compounds
2. carbon paper, carbon
a thin paper coated on one side with a dark waxy substance (often containing carbon used to transfer characters from the original to an under sheet of paper
3. carbon, carbon copy
a copy made with carbon paper
Source: WordNet® (An amazing lexical database of English)
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