Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
closed-circuit is an adjective meaning "relating to or consisting of a closed circuit". It carries one recorded sense.
relating to or consisting of a closed circuit
“closed-circuit television”
Definitions, synonyms and semantic relations for closed-circuit come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.