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subatomic particle

subatomic particle
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subatomic particle
(Copyright 2000 Houghton Mifflin Company)

n.

Any of various units of matter below the size of an atom, including the elementary particles and hadrons.


 
 
Britannica Concise Encyclopedia: subatomic particle

Any of various self-contained units of matter or energy. Discovery of the electron in 1897 and of the atomic nucleus in 1911 established that the atom is actually a composite of a cloud of electrons surrounding a tiny but heavy core. By the early 1930s it was found that the nucleus is composed of even smaller particles, called protons and neutrons. In the early 1970s it was discovered that these particles are made up of several types of even more basic units, named quarks, which, together with several types of leptons, constitute the fundamental building blocks of all matter. A third major group of subatomic particles consists of bosons, which transmit the forces of the universe. More than 200 subatomic particles have been detected so far, and most appear to have a corresponding antiparticle (see antimatter).

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Science Dictionary: subatomic particles

See elementary particles.

 
Medical Dictionary: subatomic particle

n.

Any of various units of matter below the size of an atom, including the elementary particles and hadrons.

 
WordNet: subatomic particle
Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: a particle that is less complex than an atom; regarded as constituents of all matter
  Synonyms: elementary particle, fundamental particle

 
 

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Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2007. Published by Houghton Mifflin Company. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Science Dictionary. The New Dictionary of Cultural Literacy, Third Edition Edited by E.D. Hirsch, Jr., Joseph F. Kett, and James Trefil. Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin. All rights reserved.  Read more
Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.  Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more

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