Meanings
nounradioactinium (uncountable)
- uncountablenatural sciencesThe radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years
Synonyms: actinium-227
Synonyms & antonyms
nounThe radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years
Similar
actinium-227
Origin
- Englishradio-
- Ancient Greekᾰ̓κτῑ́ς (ăktī́s)
- Frenchactino-
- Frenchactinium
- Englishactinium
- Englishradioactinium
Cite this entry
APA
radioactinium. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/radioactinium
MLA
“radioactinium.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/radioactinium. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “radioactinium,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/radioactinium.
Source: radioactinium on Wiktionary, CC BY-SA 4.0.