neutron
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trɒn, ˈnyu- noun Physics.
an elementary particle having no charge, mass slightly greater than that of a proton, and spin of ½: a constituent of the nuclei of all atoms except those of hydrogen. Symbol: n
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To neutron
Collins
World English Dictionary
neutron (ˈnjuːtrɒn) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| physics a neutral elementary particle with a rest mass of 1.674 92716 × 10--27 kilogram and spin ½; classified as a baryon. In the nucleus of an atom it is stable, but when free it decays | |
| [C20: from | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Neutron
is always a great word to know.
So is polyunsaturated fatty acid. Does it mean:
| any of a class of organic compounds that are polyhydroxy aldehydes or polyhydroxy ketones, or change to such substances on simple chemical transformations, as hydrolysis, oxidation, or reduction, and that form the supporting tissues of plants and are impo |
| unsaturated fatty acid whose carbon chain has more than double or triple valence bond per molecule |
Etymonline
Word Origin & History
neutron
1921, coined by W.D. Harkins of Chicago from neutr(al) + -on, as in electron. First record of neutron bomb is from 1960.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
neutron neu·tron (n&oomacr;'trŏn', ny&oomacr;'-)
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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
neutron (n 'trŏn') Pronunciation Key
An electrically neutral subatomic particle in the baryon family, having a mass of 1.674 × 10-24 grams (1,838 times that of the electron and slightly greater than that of the proton). Neutrons are part of the nucleus of all atoms, except hydrogen, and have a mean lifetime of approximately 1.0×103 seconds as free particles. They consist of a triplet of quarks, including two down quarks and one up quark, bound together by gluons. In radioactive atoms, excess neutrons are converted to protons by beta decay. Beams of neutrons from nuclear reactors are used to bombard the atoms of various elements to produce fission and other nuclear reactions and to determine the atomic arrangements in molecules. See Table at subatomic particle. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
When certain heavy atoms are struck by a neutron, they absorb it, become unstable and split apart.
The researchers adjusted conditions so that only neutron scattering by cholesterol was visible.
The object may well be a superdense neutron star, as predicted by theory,
But if anything it would confirm the basic picture of a pulsar as a spinning neutron star whose pulses are generated magnetically.
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