man·ga·nate /ˈmæŋgəˌnet/
  錳酸鹽
  Man·ga·nate n.  Chem. A salt of manganic acid.
  Note: ☞ The manganates are usually green, and are well-known compounds, though derived from a hypothetical acid.
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  manganate
       n : a salt of manganic acid containing manganese as its anion