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[suhb-uh-tom-ik] /ˌsʌb əˈtɒm ɪk/
adjective, Physics.
of or relating to a process that occurs within an atom.
noting or pertaining to a particle or particles contained in an atom, as electrons, protons, or neutrons.
Origin of subatomic
First recorded in 1900-05; sub- + atomic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for subatomic


of, relating to, or being a particle making up an atom or a process occurring within atoms: the electron is a subatomic particle
having dimensions smaller than atomic dimensions
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for subatomic

1903, from sub-atom (1880), from sub- + atomic.

Online Etymology Dictionary, © 2010 Douglas Harper
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subatomic in Medicine

subatomic sub·a·tom·ic (sŭb'ə-tŏm'ĭk)

  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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subatomic in Culture

subatomic definition

A descriptive term for objects and events within the atom.

The 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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