noun. An adsorbed substance.

noun. a substance which has been adsorbed

adjective. capable of being adsorbed or accumulated on a surface of a solid

noun. a material that has been or is capable of being adsorbed

"Moreover, the kinetic behavior suggests that the gate-opening process is attributable to condensation of the adsorbate on the surface of the crystal, indicating that surface chemistry, rather than crystal structure analysis, needs to be probed to fully understand the gate-opening process."

sorbate  

areal  calendula  carotenoid  costimulatory  membrane-bound