Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “free radical”

See all translations

free radical

noun [C often plural] uk   specialized us  
a molecule that has an extra electron and therefore reacts very easily with other molecules: Free radicals have been implicated in cancer and many other serious diseases.
Translations of “free radical”
in Chinese (Traditional) 自由基,遊離基…
in Chinese (Simplified) 自由基,游离基…
(Definition of free radical from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of free radical?
Add Cambridge dictionaries to your browser to your website

Word of the Day

past participle

the form of a verb, usually made by adding -ed, used in some grammatical structures such as the passive and the present perfect

Word of the Day

Euphemisms (Words used to Avoid Offending People)

by Kate Woodford,
March 04, 2015
​​​ We recently looked at the language that we use to describe lies and lying. One area of lying that we considered was ‘being slightly dishonest, or not speaking the complete truth’. One reason for not speaking the complete truth is to avoid saying something that might upset or offend people. Words and

Read More 

snapchat verb

March 02, 2015
to send someone a message using the photomessaging application Snapchat We used to have a thing until he got a girlfriend. now

Read More