an electromagnetic wave having a wavelength between 1 millimeter and 30,000 meters, or a frequency between 10 kilohertz and 300,000 megahertz.
an electromagnetic wave of radio frequency
A very low frequency electromagnetic wave (from roughly 30 kilohertz to 100 gigahertz). Radio waves are used for the transmission of radio and television signals; the microwaves used in radar and microwave ovens are also radio waves. Many celestial objects, such as pulsars, emit radio waves. See more at electromagnetic spectrum.
noun, Astronomy. 1. the range of wavelengths at which the earth’s atmosphere is transparent to radio waves. noun 1. a gap in ionospheric reflection that allows radio waves, with frequencies in the range 10 000 to 40 000 megahertz, to pass from or into space
radisectomy ra·di·sec·to·my (rā’dĭ-sěk’tə-mē) n. Variant of radectomy.
[rad-ish] /ˈræd ɪʃ/ noun 1. the crisp, pungent, edible root of the plant, Raphanus sativus, of the mustard family, usually eaten raw. 2. the plant itself. /ˈrædɪʃ/ noun 1. any of various plants of the genus Raphanus, esp R. sativus of Europe and Asia, cultivated for its edible root: family Brassicaceae (crucifers) 2. the root […]
[ra-dee-sawn] /ræ diˈsɔ̃/ noun 1. Pierre Esprit [es-pree] /ɛs pri/ (Show IPA), 1636?–1710? French fur trader and explorer in Canada.