Definition from Wiktionary, the free dictionary
- IPA: /ˈæntimæˌtɚ/, /ˈæn.taɪ.mæˌtɚ/
- (physics) Matter that is composed of the antiparticles of those that constitute normal matter.
- (physics) A form of matter that has a key property, such as charge, opposite to that of ordinary matter.
matter composed of antiparticles