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The Collaborative International Dictionary of English v.0.48 (gcide)

adsorb \ad*sorb"\ v. t.
to attract and bind (molecules of a substance in a fluid) so
as to form a thin layer on the surface, by non-electrostatic
forces; to bind by adsorption. Distinguished from {absorb},
in which the foreign substance penetrates the body of the
absorbing material.

Syn: surface assimilation
[WordNet 1.5]