Definition of antimatter
: matter composed of antiparticles
Recent Examples of antimatter from the Web
The acronym is also a nod to Paul Dirac, the English theoretical physicist who predicted the existence of antimatter.
In 1928, one man finally succeeded, and in the process, managed to predict the existence of antimatter.
The quasiparticles produced here, called Majorana fermions, are their own antimatter.
An engine fueled by antimatter could attain 19,000 miles a second.
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