An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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H I
  H I  
H I
Fr.: H I  

Atomic or → neutral hydrogen.

See also: From H, abbreviation of hydrogen + I “one” in Roman number system, nomenclature convention representing neutral atoms.