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Elementary Dictionary
       

nu·cle·us

nucleus

 
pronunciation:
nu kli s
part of speech: noun
inflections: nuclei, nucleuses
definition: The nucleus of something is the essential, central part of it. Everything else is around it and depends on it.
The busy harbor is the nucleus of activity in this small village by the sea.In biology, a nucleus is the central part of a cell, which controls growth and reproduction.In chemistry, a nucleus is the central part of an atom.
synonyms:
core
similar words:
center, heart, kernel, soul