an apparatus for water or other fluids.
a device for introducing air into a bin of wheat or other grain in order to prevent the accumulation of moisture, keeping it free of fungi and insects.
Historical Examples

An aerator is used before filtration during the summer, when algae are likely to develop in the reservoir.
Transactions of the American Society of Civil Engineers, vol. LXXII, June, 1911 E. D. Hardy


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