Usually means: Radio emission at 21 centimeters.
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We found 3 dictionaries that define the word hydrogen line:

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  1. hydrogen line: Wiktionary
  2. Hydrogen line: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)
  1. hydrogen line: Encyclopedia

Definitions from Wiktionary (hydrogen line)

noun:  (physics, astronomy) a spectral line of atomic hydrogen having a wavelength of about 21cm; used extensively in radio astronomy

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