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superstring theory

any supersymmetric string theory in which each type of elementary particle is treated as a vibration of a single fundamental string (superstring) at a particular frequency.
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World English Dictionary
superstring (ˈsuːpəˌstrɪŋ)
physics a type of one-dimensional entity postulated in certain theories of elementary particles that involve supersymmetry

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American Heritage
Science Dictionary
superstring theory   (s'pər-strĭng')  Pronunciation Key 
A type of string theory that includes the theoretical assumptions of supersymmetry.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Superstring theory is one popular candidate for tying all of physics into one
  unified theory.
Similarly, no one can really explain what extra spatial dimensions are in
  superstring theory.
Superstring theorists have already employed this group in potential theories of
Outside of superstring theory, more traditional approaches to soup up the
  standard model also failed.
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