1. A substance that adsorbs, i.e., a solid substance endowed with the property of attaching other substances to its surface without any covalent bonding, e.g., activated charcoal. 2. An antigen or antibody used in immune adsorption.
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ad·sor·bent -bənt adj having the capacity or tendency to adsorb
adsorbent n a usu. solid substance that adsorbs another substance
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ad·sor·bent (ad-sorґbənt) 1. pertaining to or characterized by adsorption. 2. an agent that attracts other materials or particles to its surface by adsorption.Medical dictionary. 2011.