radioactivity 
ra‧di‧o‧ac‧tiv‧i‧ty /ˌreɪdiəʊækˈtɪvəti, ˌreɪdiəʊækˈtɪvɪti $ -dioʊ-/ BrE AmE noun [uncountable] the sending out of ↑radiation (=a form of energy) when the ↑nucleus (=central part) of an atom has broken apart: the discovery of radioactivity high levels of radioactivity
radioactivityhu| ◎ | [,reidiouæk'tivəti] | | ※ | danh từ | | | ■ | năng lực phóng xạ; tính phóng xạ |
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