Dictionary

opsonin

noun op·so·nin \ˈäp-sə-nən\

Definition of OPSONIN

:  any of various proteins (as antibodies or complement) that bind to foreign particles and cells (as bacteria) making them more susceptible to the action of phagocytes

Origin of OPSONIN

Latin opsonare to buy provisions, cater (from Greek opsōnein) + English 1-in — more at oligopsony
First Known Use: 1903
Medical Dictionary

opsonin

noun op·so·nin \ˈäp-sə-nən\

Medical Definition of OPSONIN

:  any of various proteins (as complement or antibodies) that bind to foreign particles and microorganisms (as bacteria) making them more susceptible to the action of phagocytes

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