alkaline earth

noun Chemistry.

  1. any of the oxides of barium, radium, strontium, calcium, and, sometimes, magnesium.


  1. Also called: alkaline earth metal, alkaline earth element any of the divalent electropositive metals beryllium, magnesium, calcium, strontium, barium, and radium, belonging to group 2A of the periodic table
  2. an oxide of one of the alkaline earth metals


  1. The oxides of calcium, strontium, radium, and barium, and sometimes magnesium.

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