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Definitions of mysterium:
  • noun:   (chemistry, alchemy, now historical) Any of various unknown elements thought to make up existing forms of matter, or a substance seen as an elemental or pure form of something else.
  • noun:   (astronomy, now historical) The hypothetical source of a galactic radio emission at 1665 megahertz (later identified as due to hydroxyl radicals in interstellar space).

(Definitions from Wiktionary)

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