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Definitions

nucleus

[noo-klee-uhs, nyoo-] / ˈnu kli əs, ˈnyu- /
NOUN
core; basis for something's
Synonyms
STRONG
center crux embryo focus foundation germ heart hub kernel matter nub pivot premise principle seed spark
WEAK
beginning bud
Antonyms
STRONG
exterior exteriority outside periphery

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

All the matter around us -- including the protons and neutrons that make up the nucleus of atoms -- are made of baryons.

From Barron's • Mar. 17, 2026

According to Grzywacz, the nucleus begins in an excited state and must release energy to stabilize.

From Science Daily • Mar. 13, 2026

Scientists still need to determine the precise role these enzymes play in the nucleus.

From Science Daily • Mar. 9, 2026

The study shows that different cell types, tissues, and cancers each display their own distinctive arrangement of metabolic enzymes within the nucleus.

From Science Daily • Mar. 9, 2026

Equally, if a real photon collides with an atom, it may move an electron from an orbit nearer the nucleus to one farther away.

From "A Brief History of Time: And Other Essays" by Stephen Hawking