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nuclei

American  
[noo-klee-ahy, nyoo-] / ˈnu kliˌaɪ, ˈnyu- /

noun

  1. plural of nucleus.


nuclei British  
/ ˈnjuːklɪˌaɪ /

noun

  1. a plural of nucleus

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of nuclei

< Latin nucleī, nominative plural of nucleus; see nucleus

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.

Fusion is the process of fusing hydrogen nuclei together, which releases immense amounts of energy.

From BBC • Apr. 20, 2026

In these reactions, atomic nuclei repeatedly absorb neutrons and then undergo radioactive decay until they reach stable forms.

From Science Daily • Apr. 14, 2026

Fusion does the opposite: It combines light atomic nuclei into heavier ones, releasing enormous energy.

From The Wall Street Journal • Mar. 28, 2026

Gold cannot form until certain unstable atomic nuclei break apart.

From Science Daily • Mar. 13, 2026

Within a few days, he proposed a solution: the protons were disintegration products not of the targets but of the deutons themselves, which were “exploding” upon contact with the atomic nuclei.

From "Big Science" by Michael Hiltzik