subatomic particle

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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American Heritage
Science Dictionary
subatomic particle  [%PREMIUM_LINK%]     (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.
Cite This Source
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