WordReference Random House Unabridged Dictionary of American English © 2026
activated carbon, [Chem.]
  1. Chemistrya form of carbon having very fine pores: used chiefly for adsorbing gases or solutes, as in various filter systems for purification, deodorization, and decolorization. Also called activated charcoal. 
  • 1920–25

Collins Concise English Dictionary © HarperCollins Publishers::
activated carbon n
  1. a porous highly adsorptive form of carbon used to remove colour or impurities from liquids and gases, in the separation and extraction of chemical compounds, and in the recovery of solvents
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