Definition of radioactivate in English:

radioactivate

Line breaks: radio|acti¦vate
Pronunciation: /ˌreɪdɪəʊˈaktɪveɪt/

Entry from British & World English dictionary

verb

[with object]
Convert (a substance, molecule, etc.) into a radioactive form.

Definition of radioactivate in:

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Word of the day animalcule
Pronunciation: ˌanəˈmalˌkyo͞ol
noun
a microscopic animal