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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.
hygroscope is a noun meaning "hygrometer that shows variations in the relative humidity of the atmosphere". It carries one recorded sense.
hygrometer that shows variations in the relative humidity of the atmosphere
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 hygroscope come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.