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