Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
prognosticator is a noun meaning "someone who makes predictions of the future (usually on the basis of special knowledge)". It carries one recorded sense.
someone who makes predictions of the future (usually on the basis of special knowledge)
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 prognosticator come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.