Nucleus is a central and most important part of an object. It also refers to a positively charged central core of an atom, containing most of its mass, or a discrete mass of grey matter in the central nervous system.
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what is the definition of nucleus
The nucleus is a highly specialized organelle that serves as the information processing and administrative center of the cell. This organelle has two major functions: it stores the cell's hereditary material, or DNA, and it coordinates the cell's...
A nucleus refers to the center or core of something. In physics, the atom, which is the part that contains protons and neutrons, is where the positively charged center (nucleus) is located. You can find more information here: http://www.biology-online.org/dictionary/Nucleus