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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
opsonin is a noun meaning "an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes". It carries one recorded sense.
an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for opsonin come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.