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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.
actinometer is a noun meaning "an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)". It carries one recorded sense.
an instrument for measuring the intensity of electromagnetic radiation (usually by the photochemical effect)
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 actinometer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.