A0341000 (ăn′tē-hī′drə-jən, ăn′tī-)n. The antimatter equivalent of hydrogen.
antihydrogen
(ˈæntɪˌhaɪdrədʒən) n (Chemistry) hydrogen in which the nucleus is an antiproton with an orbiting positron
antihydrogen
antihydrogen
[¦an·tē′hī·drə·jən] (atomic physics) The antimatter counterpart of hydrogen, whose atoms each consist of an orbiting positron and a nucleus that is an antiproton, antideuteron, or antitriton.