411 REFERENCE · Wiktionary
Röntgen rays
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Roentgen-rays
English
Noun
en noun form Röntgen rays
en Röntgen ray
411 REFERENCE · Wiktionary
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.