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[op-suh-nin] /ˈɒp sə nɪn/
noun, Immunology
a constituent of normal or immune blood serum that makes invading bacteria more susceptible to the destructive action of the phagocytes.
Origin of opsonin
1900-05; < Latin opsōn(ium) victuals (< Greek opsōnía, derivative of opsōneîn to buy provisions) + -in2
Related forms
opsonoid, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for opsonin


a constituent of blood serum that renders invading bacteria more susceptible to ingestion by phagocytes in the serum
Derived Forms
opsonic (ɒpˈsɒnɪk) adjective
Word Origin
C20: from Greek opsōnion victuals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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opsonin in Medicine

opsonin op·so·nin (ŏp'sə-nĭn)
An antibody in blood serum that causes bacteria or other foreign cells to become more susceptible to the action of phagocytes.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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