Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hyperpituitarism is a noun meaning "excessive activity of the pituitary gland (especially overactivity of the anterior lobe which leads to excess secretion of growth hormone)". It carries one recorded sense.
excessive activity of the pituitary gland (especially overactivity of the anterior lobe which leads to excess secretion of growth hormone)
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 hyperpituitarism come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.