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Backflow valve

backwater valve.
a valve for preventing flowing liquid, as sewage, from reversing its direction.


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    the distance between the back surface of a lens and the focal plane when the lens is focused at infinity.

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    the analogical creation of one word from another word that appears to be a derived or inflected form of the first by dropping the apparent affix or by modification. a word so formed, as typewrite from typewriter. Historical Examples In any event, the men should be taught to take some form of a closed back […]

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