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proto- prefix

  /pɹoʊ.toʊ/ , /ˈpɹəʊ.təʊ/ , [pɹoʊ.ɾoʊ]
  • (ordinal number) First in order; which stage is first.
  • (inorganic chemistry) A minimal proportion of a particular substance when in a combination. See protosalt.
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