what do u mean by nucleus
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English Language Learners Definition of nucleus. biology : the central part of most cells that contains genetic material and is enclosed in a membrane. physics : the central part of an atom that is made up of protons and neutrons. : a central or most important part of something.
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The number of protons in thenucleus. See more at atom . An organelle in the cytoplasm of eukaryotic cells (all cells except prokaryotes) that contains nearly all the cell's DNA and controls its metabolism, growth, and reproduction
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