Which term describes the routing of sound signals in a hearing aid specifically designed for one dead ear and one normal ear?

The correct term that describes the routing of sound signals in a hearing aid specifically designed for one dead ear (non-hearing ear) and one normal ear is CROS. The CROS (Contralateral Routing of Signals) system is designed to pick up sounds from the side of the dead ear and send those signals to the hearing aid on the normal ear. This configuration allows users with single-sided deafness to perceive sounds from the side where they cannot hear, effectively improving their ability to understand speech and the overall auditory experience.

While other terms like "BiCROS" may also relate to hearing aid systems, BiCROS systems are meant for individuals with one dead ear and one ear with some degree of hearing loss; thus, they amplify sounds instead of just routing them. An amplifier is a general term for a device that increases sound volume but does not specifically pertain to the arrangement of sound signals for unique hearing situations. Compression refers to a technique used in hearing aids to manage sound volume, particularly in loud environments, but it does not address the specific routing between ears as the CROS system does.