Meaning of RADIOACTIVITY in English

RADIOACTIVITY

noun Etymology: International Scientific Vocabulary Date: 1899 the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.