Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
deaf-aid is a noun meaning "an electronic device that amplifies sound and is worn to compensate for poor hearing". It carries one recorded sense.
an electronic device that amplifies sound and is worn to compensate for poor hearing
Definitions, synonyms and semantic relations for deaf-aid come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.