Meaning of RADIOACTIVITY in English

RADIOACTIVITY

transcription, транскрипция: [ -ak-ˈti-və-tē ]

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 ; also : the rays emitted

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.