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subatomic particle

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subatomic particle  


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n.  Any of various units of matter below the size of an atom, including the elementary particles and hadrons.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

subatomic particle n.
Any of various units of matter below the size of an atom, including the elementary particles and hadrons.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
subatomic particle   (sŭb'ə-tŏm'ĭk)  Pronunciation Key 


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Any of various particles of matter that are smaller than a hydrogen atom. Protons, neutrons, and electrons are subatomic particles, as are all hadrons and leptons. See also composite particle, elementary particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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