[rad-ner-sheer, -sher] /ˈræd nərˌʃɪər, -ʃər/
a historic county in Powys, in E Wales.
(until 1974) a county of E Wales, now part of Powys
[rah-dawm] /ˈrɑ dɔm/ noun 1. a city in E Poland. /Polish ˈradɔm/ noun 1. a city in E Poland: under Austria from 1795 to 1815 and Russia from 1815 to 1918. Pop: 232 000 (2005 est)
[rey-dohm] /ˈreɪˌdoʊm/ noun 1. a dome-shaped device used to house a radar antenna. /ˈreɪdəʊm/ noun 1. a protective housing for a radar antenna made from a material that is transparent to radio waves
[rey-don] /ˈreɪ dɒn/ noun, Chemistry. 1. a chemically inert, radioactive gaseous element produced by the decay of : emissions produced by outgassing of rock, brick, etc. are a health hazard. Symbol: Rn; atomic number: 86; atomic weight: 222. /ˈreɪdɒn/ noun 1. a colourless radioactive element of the rare gas group, the most stable isotope of […]
- Radon gas
noun radon Examples We have a radon gas mitigating system. Word Origin 1934