impervious to air.
to make impervious to air.


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    an apparatus for drawing in, compressing, or exhausting air. (initial capital letters) Astronomy. the constellation Antlia. Historical Examples Either the air pump or steam may be employed to create a partial void in the receiver beneath the filter. A Dictionary of Arts, Manufactures and Mines Andrew Ure Now place this apparatus under the receiver of […]

  • Air quality

    noun a measurement of the pollutants in the air; a description of healthiness and safety of the atmosphere Examples Smog is a mixture of pollutants, principally ground-level ozone and produced by chemical reactions, that greatly affects air quality. Contemporary Examples That sharp dip in air quality across the nation Sunday night? The ‘Reign’ Steamy Stairwell […]

  • Air quality index

    air quality index A measure of the quantity of harmful particles and chemicals in the air. Note: The index is used by weather forecasters to indicate the purity of the air on a given day. The higher the index, the smoggier (see smog) and more polluted the air. Contemporary Examples By comparison, New York’s air […]

  • Air quote

    a gesture in which two fingers of each hand draw quotation marks in the air, used when uttering a word or phrase one does not think is appropriate or accurate. Compare . noun the use of one’s index and middle fingers on each hand to gesture quotation marks for a word or saying Examples Air […]

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