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| op·so·nin [ ópsənin ] (plural op·so·nins) |
noun |
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| Definition: |
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substance that marks foreign bodies: a protein fragment in blood that binds to the surface of an invading antibody and promotes its destruction by white blood cells
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| [Early 20th century. < Latin opsonare "cater, buy provisions" < Greek opsōnein "condiment"] |
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