Home›Dictionary›roentgenroentgennounlegacy unit of measurement for the kerma of X-rays and gamma rays up to 3 MeV; equals 0.258 mC/kgL326884 on Wikidata ↗WiktionaryPronunciation: /ˈɹɜːnt.ɡən/nameAlternative form of Röntgen.nounAlternative form of röntgen.