from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An electrically neutral subatomic particle in the baryon family, having a mass 1,839 times that of the electron, stable when bound in an atomic nucleus, and having a mean lifetime of approximately 1.0 × 103 seconds as a free particle. It and the proton form nearly the entire mass of atomic nuclei. See Table at subatomic particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A subatomic particle forming part of the nucleus of an atom and having no charge; it is a combination of an up quark and two down quarks

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an elementary particle with 0 charge and mass about equal to a proton; enters into the structure of the atomic nucleus


neutr(al) + -on1.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • Hee! The Chem student in me loves these!

    April 8, 2008

  • Haha! Cracks me up every time.

    An atom walks into a bar. "Hey, why so glum?" asks the bartender. "I think my electron left me," Atom says.

    "Are you sure?" says the bartender.

    "Yes. I'm positive."

    April 8, 2008

  • A neutron walks into a bar and says "Hey, how much for a beer?"

    The bartender replies "For you, no charge."

    April 8, 2008