<chemistry> Any insoluble material for example cellulose, with either an antigen or an antibody bound to it and that will bind its corresponding antibody or antigen thus removing it from a solution. ... (18 Nov 1997) ... 
(im″u-no-ad-sor´bәnt) a preparation of antigen attached to a solid support or antigen in an insoluble form, which adsorbs homologous antibodies from a mixture of immunoglobulins.
Any insoluble material, eg. cellulose, with either an antigen or an antibody bound to it and that will bind its corresponding antibody or antigen thus removing it from a solution.
immunosorbent.