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'''Nucleus''' fundamentally means "kernel" or "central core." Nucleus is pronounced NEW-klee-us. The plural is nuclei, pronounced NEW-klee-eye. In science, this term has five main uses:

{{Neuron map|Cell Nucleus}}'''Nucleus''' fundamentally means "kernel" or "central core." Nucleus is pronounced NEW-klee-us. The plural is nuclei, pronounced NEW-klee-eye. In science, this term has five main uses:

'''In [[biology]],''' the region of a [[eukaryotic cell]] about 10 - 20 nanometres in diameter which usually looks dark and round under the microscope. It was identified and given the name long before it was discovered that it contains the [[chromosome]]s, which contain the [[cell]]'s [[DNA]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>

'''In [[biology]],''' the region of a [[eukaryotic cell]] about 10 - 20 nanometres in diameter which usually looks dark and round under the microscope. It was identified and given the name long before it was discovered that it contains the [[chromosome]]s, which contain the [[cell]]'s [[DNA]].<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>