Earphone (noun)

1. A small device worn in or over the ear to enable the user to hear sound from a telephone, radio, or other audio source.
2. A device worn in or over the ear that allows the user to listen to music or other audio.

Origin:

Early 20th century: blend of ear and telephone.

Examples:

1. He put on his earphones and listened to music on his phone.
2. The earphones were designed to block out external noise.
3. She used earphones to listen to an audio book while she was cooking.
4. The earphones came with a microphone so he could take calls while listening to music.
5. The earphones had a comfortable fit, making them perfect for long periods of use.