roentgen C2 Topic:Mathematics & Measurement US /ˈrent.ɡən/ UK /ˈrɒnt.ɡən/ See IPA manual Freq #111968 Meanings 1 noun a non-SI unit of exposure to X-rays or gamma rays, equal to 0.000258 coulomb per kilogram of dry air The instrument recorded an exposure of several roentgens near the source. Thesaurus Word family Forms roentgens Derived forms roentgenology Related forms radiationradremgraysievert Common collocations roentgen ray Noun + noun Etymology Named for German physicist Wilhelm Conrad Röntgen, who discovered X-rays in 1895. The unit name was adopted internationally in the early twentieth century. Topics Mathematics & Measurement External links Cambridge Dictionary Wiktionary Google Images # roentgen **Type:** Word **Level:** C2 **Part of speech:** noun **IPA (US):** /ˈrent.ɡən/ **IPA (UK):** /ˈrɒnt.ɡən/ **Frequency rank:** 111968 ## Meanings 1. a non-SI unit of exposure to X-rays or gamma rays, equal to 0.000258 coulomb per kilogram of dry air ## Examples - The instrument recorded an exposure of several roentgens near the source. ## Derived Forms - roentgenology ## Related Forms - radiation - rad - rem - gray - sievert ## Etymology Named for German physicist Wilhelm Conrad Röntgen, who discovered X-rays in 1895. The unit name was adopted internationally in the early twentieth century. ## Topics - Mathematics & Measurement markdown