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| any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent |
| a chemical that consumes or renders inactive the impurities in a mixture |
| alkaline earth | |
| —n | |
| 1. | alkaline earth metal, Also called: 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 |