adsorbent ad·sor·bent uncommon adjective (1) noun (1) adjective 1. having capacity or tendency to adsorb or cause to accumulate on a surface Synonymsadsorptivesurface-assimilative Antonymsnonadsorbent Similarchemisorptive noun 1. a material having capacity or tendency to adsorb another substance Synonymsadsorbent material Related words Word family adsorb Broader terms sorbent WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.