Term used in chemistry with one predominant and two subsidiary, looser meanings. It most often refers to a free radical. It can also mean an ion or a functional group.
This entry comes from Encyclopædia Britannica Concise.For the full entry on radical, visit Britannica.com.
What made you look up radical? Please tell us what you were reading, watching or discussing that led you here.
Take our visual vocab quiz
A quick quiz about stuff worth knowing
The commonly misspelled words quiz
The Vocab Quiz Game for iPhone & iPad
"Incredibly fun and addictive. And informative!" User Review, iTunes