noun
a device used to introduce air into a material, typically soil or water, to improve its quality
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The aerator in the fish tank helps to oxygenate the water for the fish.
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Don't forget to clean out the aerator in the sink to keep the water flowing smoothly.
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I heard that using an aerator on your lawn can really make the grass look lush and green.
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She was like an aerator in the meeting, bringing fresh ideas and energy to the discussion.