A receiver of a telephone to hold near to one's ear.
The arm on a pair of glasses that hooks over the ear to hold them in place.
A speaker placed inside or held near to the ear.
A device for transmitting conversations and other sounds in real time across distances, now often a small portable unit also capable of running software etc.
A speech segment that possesses distinct physical or perceptual properties, considered as a physical event without regard to its place in the phonology of a language.
To call (someone) using a telephone.