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WordReference Random House Unabridged Dictionary of American English © 2024al′kaline earth′, [Chem.]- Chemistryany of the oxides of barium, radium, strontium, calcium, and, sometimes, magnesium.
Collins Concise English Dictionary © HarperCollins Publishers:: alkaline earth n - 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
- an oxide of one of the alkaline earth metals
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