Acquired hearing loss
Amplifier
Analog sound processing
Anvil
Assistive listening devices
Audiogram
Audiologist
Auditory nerve

Acquired hearing loss
Hearing loss obtained after birth (not congenital). Noise, disease, viruses, drugs or old age can cause an acquired hearing loss.

Amplifier
The amplifier constitutes the electronics of the hearing aid and consists of various circuit elements.
The amplifier processes the signal from the hearing aid’s microphone according to the settings of the hearing aid.

Analog sound processing
Analog sound processing basically means that the sound vibrations which become an electrical signal after entering the microphone are acted upon as one unified, but complex, electrical signal by the amplifier.

Anvil
Anvil is the common name given to the small incus bone, which is the second of the three bones (ossicles) that work in series in the middle ear to transmit sound to the inner ear. Also see under H (Hammer, Anvil and Stirrup)

Assistive listening devices
These are devices, such as a telephone amplifier or remote doorbell, which can help you in situations where you have difficulty hearing – either because of background noise or because sounds come from far away.
For more information try this link: Assistive listening devices

Audiogram
An audiogram is the written record of a hearing test.
More precisely, it is a graphical representation of hearing threshold for pure tones. For each ear it shows the minimum loudness required for the tested person to be able to hear each sound (per different frequency or pitch).

Audiologist
Audiology is the science of hearing. An audiologist is a degreed professional (master's level or higher) trained to evaluate hearing loss and prescribe, fit and adjust hearing aids and assistive listening systems.

Auditory nerve
This is the auditory section of the central nervous system. This nerve transmits the auditory information to the brain.