verb (used with object), opsonized, opsonizing. Immunology.
to increase the susceptibility of (bacteria) to ingestion by phagocytes.
Also, especially British, opsonise.

opson(in) + -ize

opsonization, noun
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World English Dictionary
opsonize, opsonise or opsonify (ˈɒpsəˌnaɪz, ɒpˈsɒnɪˌfaɪ)
(tr) to subject (bacteria) to the action of opsonins
opsonise, opsonise or opsonify
opsonify, opsonise or opsonify
opsoni'zation, opsonise or opsonify
opsoni'sation, opsonise or opsonify
opsonifi'cation, opsonise or opsonify

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American Heritage
Medical Dictionary

opsonize op·so·nize (ŏp'sə-nīz')
v. op·so·nized, op·so·niz·ing, op·so·niz·es
To make bacteria or other cells more susceptible to the action of phagocytes.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
These antibodies and complement interact to opsonize pneumococci, which facilitates phagocytosis and clearance of the organism.
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