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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.
thrombin is a noun meaning "an enzyme that acts on fibrinogen in blood causing it to clot". It carries one recorded sense.
an enzyme that acts on fibrinogen in blood causing it to clot
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 thrombin come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.