Definition of Opsonin
1. Noun. An antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes.
Definition of Opsonin
1. an antibody of blood serum [n -S]
Medical Definition of Opsonin
1.
Substance that binds to the surface of a particle and enhances the uptake of the particle by a phagocyte. Probably the most important in mammals derive from complement (C3b or C3bi) or immunoglobulins which are bound through the Fc receptor).
This entry appears with permission from the Dictionary of Cell and Molecular Biology
(11 Mar 2008)
Lexicographical Neighbors of Opsonin
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