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1. Oxford Dictionary

   alkaline earth

   • n.
     any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table. They are reactive, electropositive, divalent metals, and form basic oxides which react with water to form comparatively insoluble hydroxides.

   • noun: alkaline earth, plural noun: alkaline earths