to gather (a gas, liquid, or dissolved substance) on a surface in a condensed layer:
Charcoal will adsorb gases.
to undergo or cause to undergo a process in which a substance, usually a gas, accumulates on the surface of a solid forming a thin film, often only one molecule thick: to adsorb hydrogen on nickel, oxygen adsorbs on tungsten Compare absorb (sense 8)

1882, transitive (intransitive use attested from 1919), back-formation from adsorption (1882), coined in German from ad- + -sorption, abstracted from absorption. See absorb. Related: Adsorbent; adsorption.

adsorb ad·sorb (ād-sôrb’, -zôrb’)
v. ad·sorbed, ad·sorb·ing, ad·sorbs
To take up by adsorption.

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