a college campus that was a nucleus of opposition to the war
the nucleus of the movement's methodology has always been passive resistance
Recent Examples on the WebAnother candidate is active galactic nuclei (AGNs) typically found at the center of galaxies and assumed to contain a supermassive black hole.—Jennifer Ouellette, Ars Technica, 23 Nov. 2023 In 1940 scientists used a particle accelerator at the University of California, Berkeley, to bombard an isotope of uranium (which has 92 protons per atom) with nuclei of deuterium (a proton and a neutron stuck together).—Sarah Scoles, Scientific American, 14 Nov. 2023 This contains the nucleus accumbens—an area associated with motivation and action, including compulsive urges.—Emily Mullin, WIRED, 30 Oct. 2023 Astronomers estimated the comet's nucleus stretches 12.4 miles, or roughly twice the size of Mount Everest.—Emma Colton, Fox News, 28 Oct. 2023 In the summer of 1981, Thurston Moore was tapped to curate a nine-day noise-rock showcase at White Columns, then a trendy nucleus of downtown Manhattan’s underground scene.—Samuel Hyland, Pitchfork, 25 Oct. 2023 Most of the lithium on Earth is an isotope called lithium-7, meaning the nucleus has 3 protons and 4 neutrons.—Erik Klemetti, Discover Magazine, 20 Sep. 2023 When later atomic research found that uranium’s unstable nucleus could be used to make a powerful bomb, the U.S. Army’s Manhattan Project began searching for a reliable source of uranium.—Roger Peet, The New Republic, 30 Aug. 2023 Next, Raslan sought out Casey Halpern, an associate professor of neurosurgery at Penn Medicine who is studying the nucleus accumbens as a DBS target for psychiatric conditions.—Emily Mullin, WIRED, 30 Oct. 2023 See More
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'nucleus.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
New Latin, from Latin, kernel, from nuc-, nux nut — more at nut
: a central point, group, or mass of something: as
: the small, brighter, and denser part of a galaxy or of the head of a comet
: a cell part that is characteristic of all living things with the exception of viruses, bacteria, and blue-green algae, that is necessary for heredity and for making proteins, that contains the chromosomes, and that is enclosed in a nuclear membrane
: a mass of gray matter or group of neurons in the central nervous system
: the central part of an atom that includes nearly all of the atomic mass and consists of protons and usually neutrons
from modern Latin nucleus "the central part of something," from Latin nucleus "kernel," derived from nux "nut"
: a cellular organelle of eukaryotes that is essential to cell functions (as reproduction and protein synthesis), is composed of nuclear sap and a nucleoprotein-rich network from which chromosomes and nucleoli arise, and is enclosed in a definite membrane
: a mass of gray matter or group of nerve cells in the central nervous system
: a characteristic and stable complex of atoms or groups in a molecule