subatomic

[suhb-uh-tom-ik]
adjective Physics.
1.
of or pertaining to a process that occurs within an atom.
2.
noting or pertaining to a particle or particles contained in an atom, as electrons, protons, or neutrons.

Origin:
1900–05; sub- + atomic

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
subatomic (ˌsʌbəˈtɒmɪk)
 
adj
1.  of, relating to, or being a particle making up an atom or a process occurring within atoms: the electron is a subatomic particle
2.  having dimensions smaller than atomic dimensions

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

subatomic
1903, from sub-atom (1880), from sub- + atom.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

subatomic sub·a·tom·ic (sŭb'ə-tŏm'ĭk)
adj.

  1. Of or relating to the constituents of the atom.

  2. Having dimensions or participating in reactions characteristic of the constituents of the atom.

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
Cultural Dictionary

subatomic definition


A descriptive term for objects and events within the atom.

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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Example sentences
They are composed largely of gas and plasma, a superheated state of matter
  composed of subatomic particles.
For example, it shows that the decay of subatomic particles is necessarily
  probabilistic.
Matter is programmed at the subatomic level to respond in predetermined ways.
Latest data show the subatomic particles continue to break the speed limit.
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