Nuclear means "of or belonging to the nucleus (or center) of something". Which pronunciations of "nuclear" are commonly acceptable is a matter of some debate and amusement; see Nucular for an example.

• Where the subject is the nucleus of an atom, "nuclear" usually refers to nuclear physics.
  • See also: nuclear reactor, nuclear weapon, nuclear warfare, atomic nucleus, nuclear energy, radioactivity, radioactive waste, renewable energy
• In biology, it refers to the cell nucleus.
• The term nuclear is also sometimes used to refer to a family type. See: nuclear family.

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