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.
Comparison of an amateur radio handheld transceiver, cell phone, and matchbox. A radiotelephone (or radiophone) is a communications system for transmission of speech over radio. Radiotelephone systems are not necessarily interconnected with the public land line telephone network. Radiotelephony means transmission of sound (audio) by radio, in contrast to radiotelegraphy (transmission of telegraph signals) or video transmission.