HyperDic: opsonin

English > 1 sense of the word opsonin:
NOUNsubstanceopsoninan antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
English > opsonin: 1 sense > noun 1, substance
MeaningAn antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes.
BroaderantibodyAny of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response
Substance ofserum, blood serumAn amber, watery fluid, rich in proteins, that separates out when blood coagulates
Spanishopsonina

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