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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.
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Scientific definitions for subatomic particle

subatomic particle
[ sŭb′ə-tŏmĭk ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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