adsorbate adsorbate /ˈædzɔːrbeɪt/

adjective

1. Capable of being adsorbed or accumulated on a surface of a solid  ( adsorbable , adsorbate )
   capable of being adsorbed or accumulated on a surface of a solid
   

noun

1. A material that has been or is capable of being adsorbed  ( adsorbate )
   a material that has been or is capable of being adsorbed