noun, Chemistry, Biochemistry.
an atom or molecule that bears an unpaired electron and is extremely reactive, capable of engaging in rapid chain reactions that destabilize other molecules and generate many more free radicals: in the body, deactivated by antioxidants, uric acid, and certain enzyme activities.
an atom or group of atoms containing at least one unpaired electron and existing for a brief period of time before reacting to produce a stable molecule Sometimes shortened to radical Compare group (sense 10)
free radical n.
An atom or group of atoms that has at least one unpaired electron and is therefore unstable and highly reactive. In animal tissues, free radicals can damage cells and are believed to accelerate the progression of cancer, cardiovascular disease, and age-related diseases.
[free-reynj] /ˈfriˌreɪndʒ/ adjective 1. (of livestock and domestic poultry) permitted to graze or forage for grain, etc., rather than being confined to a feedlot or a small enclosure: a free-range pig. 2. of, relating to, or produced by free-range animals: free-range eggs. adjective 1. (mainly Brit) kept or produced in natural nonintensive conditions: free-range hens, […]
noun, Nautical. 1. sailing on a free reach.
- Free recall
noun 1. (psychol) the recollection of the members of a list of items without regard to their serial order
noun 1. unhampered freedom of movement, choice, or action: Students have free rein to choose their own class schedules. see: free hand