radiotropic ra·di·o·trop·ic (rā’dē-ō-trŏp’ĭk, -trō’pĭk)
Moving or reacting in response to radiation.
ra’di·ot’ro·pism (-ŏt’rə-pĭz’əm) n.
[rey-dee-oh-vizh-uh n] /ˈreɪ di oʊˌvɪʒ ən/ noun, Now Rare. 1. .
- Radio valve
noun 1. another name for valve (sense 3)
noun, Electricity. 1. an electromagnetic wave having a wavelength between 1 millimeter and 30,000 meters, or a frequency between 10 kilohertz and 300,000 megahertz. noun 1. an electromagnetic wave of radio frequency radio wave A very low frequency electromagnetic wave (from roughly 30 kilohertz to 100 gigahertz). Radio waves are used for the transmission of […]
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