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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.
ultramicroscope is a noun meaning "light microscope that uses scattered light to show particles too small to see with ordinary microscopes". It carries one recorded sense.
light microscope that uses scattered light to show particles too small to see with ordinary microscopes
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 ultramicroscope come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.