Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “nucleus”

See all translations

nucleus

noun [C]  /ˈnu·kli·əs/ ( plural nuclei  /ˈnu·kliˌɑɪ/) us  
the central part of something People or things that form the nucleus of something are the most important part of it: These two people will form the nucleus of a new management team to promote sales in South America. physics A nucleus is the central part of an atom. biology A nucleus is the central part of a cell that controls its growth.
Translations of “nucleus”
in Korean 핵, (세포)핵…
in Arabic نَواة…
in French noyau, nucléus…
in Turkish atom çekirdeğinin merkezi, nükleon, bir şeyin/bir fikrin çekirdeği/özü/esası…
in Italian nucleo…
in Chinese (Traditional) 原子核, 細胞核…
in Russian ядро…
in Polish jądro, trzon…
in Spanish núcleo…
in Portuguese núcleo…
in German der Kern…
in Catalan nucli…
in Japanese 原子核, 細胞核…
in Chinese (Simplified) 原子核, 细胞核…
(Definition of nucleus from the Cambridge Academic Content Dictionary © Cambridge University Press)
What is the pronunciation of nucleus?
Add Cambridge dictionaries to your browser to your website

Definitions of “nucleus” in other dictionaries

Word of the Day

make believe

believing or imagining things that appear to be attractive or exciting, but are not real

Word of the Day

Lies, lies, lies!

by Kate Woodford,
February 25, 2015
​​​ According to sociologists (=people who study the relationships between people living in groups), we are good at lying. As a species, we have developed a remarkable ability to deceive each other (= persuade each other that something false is true). Being able to say things that are not true can help with

Read More 

showrooming noun

February 23, 2015
the activity of examining a product in a physical store and then making the purchase with an online retailer Amazon’s new smartphone is specifically designed to make showrooming fast and easy.

Read More