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1. Oxford Dictionary

   antimatter

   • IPA[ˈantɪˌmatə]

   英式

   • n.
     matter consisting of elementary particles which are the antiparticles of those making up normal matter.

   • noun: antimatter

2. • 更多解釋

   antimatter

   • IPA[ˈan(t)ēˌmadər]

   美式

   • n.
     molecules formed by atoms consisting of antiprotons, antineutrons, and positrons. Stable ...

   Oxford American Dictionary