Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
calcitonin is a noun meaning "thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone". It carries one recorded sense.
thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone
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 calcitonin come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.