Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “nucleus”

nucleus

noun [C] uk   /ˈnjuː.kli.əs/ us    /ˈnuː-/ (plural nuclei or nucleuses)
specialized physics the central part of an atom, usually made up of protons and neutrons specialized biology the part of a cell that controls its growth: DNA is stored in the nucleus of a cell. the nucleus of sth the group of people or things that are the most important part of something: These three players will form the nucleus of a revised and stronger team.
(Definition of nucleus from the Cambridge Advanced Learners Dictionary & Thesaurus © 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

look on the bright side

to find good things in a bad situation

Word of the Day

The language of work

by Kate Woodford,
October 15, 2014
Most of us talk about our jobs. We tell our family and friends interesting or funny things that have happened in the workplace (=room where we do our job), we describe – and sometimes complain about – our bosses and colleagues and when we meet someone for the first time, we tell

Read More 

life tracking noun

October 20, 2014
the use of one or more devices or apps to monitor health, exercise, how time is spent, etc.

Read More