What is the definition of Radioactive? | Dictionary.net

RADIOACTIVE

\ɹˌe͡ɪdɪə͡ʊˈaktɪv], \ɹˌe‍ɪdɪə‍ʊˈaktɪv], \ɹ_ˌeɪ_d_ɪ__əʊ_ˈa_k_t_ɪ_v]\

Definitions of RADIOACTIVE

1919 - The Winston Simplified Dictionary
1920 - A practical medical dictionary.

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Capable of sending forth invisible rays, such as X rays, composed of particles moving at high velocity.
Radioactivity.

1919 - The Winston Simplified Dictionary
By William Dodge Lewis, Edgar Arthur Singer

Possessing radioactivity.

1920 - A practical medical dictionary.
By Stedman, Thomas Lathrop

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