An antihydrogen is an atom of the antimatter equivalent of hydrogen, or the antimatter equivalent of hydrogen as a collective.

Antihydrogen is the antimatter equivalent of hydrogen. An antihydrogen atom consists of an antielectron (also called a positron) and an antiproton.

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Antihydrogen is the anti-matter analogue of hydogen made from a positron and an antiproton.

The first known antihydrogen atom was synthesized in 1995 at the CERN laboratory in Geneva. However, antimatter itself is produced constantly in the natural environment.