[ op-suh-nin ]
/ ˈɒp sə nɪn /
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 formsop·so·noid, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for opsonin
In the case of diphtheria, the antitoxin appears to be more efficacious than an opsonin.The Pros and Cons of Vivisection|Charles Richet
The "opsonin," or "relish," is something exuded into or produced in the blood fluid when the attacking microbe arrives.More Science From an Easy Chair|Sir E. Ray (Edwin Ray) Lankester
British Dictionary definitions for opsonin
/ (ˈɒpsənɪn) /
a constituent of blood serum that renders invading bacteria more susceptible to ingestion by phagocytes in the serum
Derived Formsopsonic (ɒpˈsɒnɪk), adjective
Word Origin for opsonin
C20: from Greek opsōnion victuals
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medicine definitions for opsonin
[ 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.