radium emanationEnglishOxford New American Dictionaryradium emanation /ˈrādēəm ˌeməˈnāSHən, ˈreɪdiəm ˌɛməˈneɪʃən/ ▸ noun archaic term for radon.
EnglishOxford New American DictionaryEnglishOxford New American Dictionary
