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Contraterrene Matter (Antimatter)  
  Contraterrene (CT) Matter (sometimes abbreviated "Seetee").  

An early treatment of antimatter in science fiction.

For "seetee" to the engineer's mind of old Jim Drake, meant power. Terror to others, to him it was atomic energy, priceless and illimitable. The whole meteor belt was rich in contraterrene drift; matter inside out, with electrons and positrons in reverse positions. It was the dangerous debris of that terrific cataclysm, before the time of man, when a strange stellar wanderer of contraterrene matter shattered the trans-Martian planet. When it touched common matter, the result was a spectacular blaze of gamma radiation; and mutual annihilation - unlike forms of matter canceled out, to leave free neutrons and pure energy.
From Collision Orbit, by Jack Williamson.
Published by Astounding in 1942
Additional resources -

The first science fiction story to deal with antimatter was Minus Planet, by John D. Clark, in 1937; see the article for antron.

The idea of antimatter was first proposed by physicist Paul Dirac in 1928; the discovery of the positron in 1932.

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Additional resources:
  More Ideas and Technology from Collision Orbit
  More Ideas and Technology by Jack Williamson
  Tech news articles related to Collision Orbit
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