Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
loud-hailer is a noun meaning "a portable loudspeaker with built-in microphone and amplifier". It carries one recorded sense.
a portable loudspeaker with built-in microphone and amplifier
Definitions, synonyms and semantic relations for loud-hailer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.