earpiece: The part of a telephone handset which is put near to the ear.
earth: A conductor physically connected to the ground. (US usage is simply ground.)
earth leakage circuit breaker (ELCB): Obsolete term for a residual current device. (Hist.)
earth loop: A fault condition affecting signals passed between units where circulating currents in multiple ground paths introduce hum.
earth station: A transmitting and/or receiving station on Earth forming part of a satellite (2) communications system. Also called a ground station.
earwig: A small earpiece used to give actors a guide track, often music. (Colloq.)
echo: (1) The return of characters from a keyboard to a monitor screen (1): local echo coming direct from the point of origination, remote ...