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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.
sweep-second is a noun meaning "a second hand that is mounted on the same center as the hour and minute hand and is read on the minutes". It carries one recorded sense.
a second hand that is mounted on the same center as the hour and minute hand and is read on the minutes
Definitions, synonyms and semantic relations for sweep-second come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.