opsonin: Meaning and Definition of

op•so•nin

Pronunciation: (op'su-nin), [key]
— n. Immunol.
  1. a constituent of normal or immune blood serum that makes invading bacteria more susceptible to the destructive action of the phagocytes.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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