Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An antibody or product of complement activation in blood serum that causes bacteria or other foreign cells to become more susceptible to the action of phagocytes.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any antibody that causes an invading species to be more susceptible to phagocytosis

from The Century Dictionary and Cyclopedia

  • n. A hypothetical substance, present in blood-serum, upon which the phagocytic action of the leucocytes is dependent.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Latin opsōnāre, to buy provisions (from Greek opsōnein, from opson, condiment, delicacy) + -in.

Examples

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  • There's ketchup in our blood?

    June 11, 2010