free rad·i·cal
noun/ˌfriː ˈrædɪkl/
/ˌfriː ˈrædɪkl/
(chemistry)- an atom or group of atoms that has an electron that is not part of a pair, causing it to take part easily in chemical reactions. Free radicals in the body are thought to be one of the causes of diseases such as cancer.
自由基；游离基