Added 9 October 2026
radioactive
/ˌɹeɪdiəʊˈaktɪv/ adjective
In Latin: none, coined in 1898 Coined: 1898, by Pierre Curie Wiktionary
adjective Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about radioactive at Wordnik → Where our words come from →
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Exhibiting or caused by radioactivity.
radioactive isotope
Origin
Coined by Pierre Curie and Marie Curie in 1898 as French radio-actif, equivalent to English radio- + active.
From Wiktionary, via Kaikki.org (CC BY-SA)