antihydrogen

American  

[an-tee-hahy-druh-juhn, an-tahy-] / ˌæn tiˈhaɪ drə dʒən, ˌæn taɪ- /

noun

Physics.

1. the antimatter counterpart to hydrogen.

---

antihydrogen British  

/ ˈæntɪˌhaɪdrədʒən /

noun

1. hydrogen in which the nucleus is an antiproton with an orbiting positron

---

antihydrogen Scientific  

/ ăn′tē-hī′drə-jən,ăn′tī- /

1. The antimatter that corresponds to hydrogen. Antihydrogen has been useful in studies of the relationship between matter and antimatter, because its matter equivalent (hydrogen) is one of the most studied and most well understood forms of matter.

---

Example Sentences

Last year a separate team of researchers tested whether antihydrogen responded differently to gravity by seeing if it fell up or down when dropped.

From BBC • Feb. 22, 2024

The scientists reduced the strength of the trap's top and bottom magnetic fields until the antihydrogen atoms could escape and the relatively weak influence of gravity became apparent.

From Science Daily • Sep. 27, 2023

Within the experiment’s margin of error, the researchers could detect no gravitational differences between antihydrogen and hydrogen.

From Scientific American • Sep. 27, 2023

The antihydrogen atoms are relatively hot and fast moving, and prone to fly out the top and the bottom of the tall cylindrical trap, making the effect of gravity hard to discern.

From Science Magazine • Sep. 27, 2023

Take antihydrogen, which is the antimatter version of hydrogen, used in the Cern experiments.

From BBC • Sep. 27, 2023