backflow

[bak-floh]
noun
a flow of a liquid opposite to the usual or desired direction.

Origin:
1880–85; back2 + flow

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Backflow is the undesirable reversal of the flow of water.
If you have your backflow device inspected or installed please keep a copy of this for your records.
The easiest way to keep you and your family safe from the potential hazards of backflow is to not create cross connections.
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