immune opsonin

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an antibody that renders bacteria and other cells susceptible to phagocytosis. adj., adj opson´ic.
immune opsonin an antibody that sensitizes a particulate antigen to phagocytosis.

spe·cif·ic op·so·nin

antibodies formed in response to stimulation by a specific antigen, either as a result of an attack of a disease or as a result of injections with a suitably prepared suspension of the specific microorganism.

immune opsonin

Opsonin formed after stimulation by a specific antigen.
See also: opsonin