free radical

noun

, Chemistry, Biochemistry.

1. 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.

free radical

noun

1. See group
   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 toradical Compare group

free radical

1. 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.

Word History and Origins

Origin of free radical¹

First recorded in 1895–1900

Example Sentences

Long-term users didn’t show a big increase in free radicals when they vaped.

From Science News For Students

This compound has several functions, including fighting free radicals that may be slowing down your collagen production, boosting the production of new collagen, and helping you safely store the collagen you already have.

From Popular-Science

Mohara explains that free radicals in polluted air touch your skin and trigger a chemical reaction that destroys collagen.

From Popular-Science

ARIES Hitting your stride, you personify progressive ideals without seeming like a free radical.

From The Daily Beast

I always thought a free radical was a political bomb thrower out of jail.

From Project Gutenberg