rootâ² canal` ther`apy. n. 1. the branch of endodontics that treats disease of the dental pulp. 2. a treatment for such disease in which the pulp is removed and replaced by filling material.
A textphone is a device that enables phone calls to be made using text. Textphone software can be used on a computer to enable it to be used as a textphone.
A speakerphone is a device that uses a microphone and a loudspeaker simultaneously so a person(s) can communicate with others without using a headset or a handheld unit. It is a common feature on most wireless, landline and mobile phones, and comes as a standard accessory in many cars.