Top Definition
the central part of an atom.
Contains protons and neutrons.
The nucleus of Uranium-238 contains 92 protons and 146 neutrons
by PrivateDonut February 10, 2005

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is the Nacho that all the cheese is attached too. Every plate of Nachos has one.
If you pick up a nacho and 20 others come up with it, that is the nucleus.
by scrag_10 April 29, 2008

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(n. v. adj. pronoun, adverb, etc.) - word used as an alternative to a word one cannot think of due to a temporary lapse in brain function or laziness.
"I referenced today's date with the purchase order number for... nucleus."
by Mavrik1621 December 14, 2009

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(interjection) - used as an exclamation of pain, surprise, pity, complaint, dislike, joy, etc.
He shouted, "Nucleus!" as they stared at the most expensive car they had ever seen.
by Mavrik1621 December 14, 2009

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(noun) - used to inadvertently acknowledge the presence of a good looking woman
"Nucleus", he whispered as they pretended not to noticed the two tits on a stick standing behind them in line.
by Mavrik1621 December 14, 2009

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Word of appraisal. Meaning cool.. Known as a positive remark. Nucleus by definition is the center of an atom which all electrons and protons constantly orbit around. Thus nucleus means 'center of attention'.
-"Have you seen his new music video? Yo that shit is nucleus! "

-" Them kicks is looking nucleus."

-"That shirt is nucleus yo!"
by DMenacekid January 21, 2011

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