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subatomic particle

subatomic particle in Medicine

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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subatomic particle in Science
subatomic particle
  (sŭb'ə-tŏm'ĭk)   

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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