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.
Radio, Telephony. a device consisting of one or two earphones with a headband for holding them over the ears and sometimes with a mouthpiece attached. 2. earphones or headphones. Origin of headset.