Word parts head + phone Pronunciation (UK) IPA (key): /ˈhedfəʊn/ (US) IPA (key): /ˈhedfoʊn/ Audio (UK)(file) Noun Singular headphone Plural headphones (countable) (usually plural) A headphone is a very little machine near a person's ear that makes sound. The music on the person's headphones was so loud that he didn't know I was talking to him. Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads