from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A flow of fluid in the opposite direction of its regular flow.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The flow of a fluid (through a pipe etc) in a direction opposite to that which is normal or intended

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a flow that returns toward its source


Sorry, no etymologies found.


  • Joe the Plumber, who found his name repeated again and again by Barack Obama and John McCain during one of the 2008 presidential debates, has somehow bubbled up, like some kind of backflow, into the debate over Proposition B, the ballot measure to bring commonsense standards to large-scale dog breeding operations in the largest of the puppy mill states.

    Wayne Pacelle: Playing Politics with Puppy Mill Abuse

  • However, it is also near an area of the northern Gulf where a "backflow" pushes west towards the western Louisiana and upper-Texas coastlines.

    The Daily News - News

  • Abnormal development of the tricuspid valve during pregnancy, causing an abnormally positioned valve that does not open easily (stenosis) and allows backflow of blood from the right ventricle into the right atrium (regurgitation).

    Cardiac terms and definitions

  • The mitral valve, which controls high pressure blood flow between chambers on the left, gets floppy and allows backflow.

    Clive Meanwell, M.D.: A Revolution for Heart Valve Jobs

  • Apparently the creek running through the town was developed as park/recreation area and some section of it was pushed into pipes, which were two narrow to allow the increased volume of water to pass, which caused backflow and tsunami-like wave, which swept through the town.

    Australian floods: Why were we so surprised?

  • Plumbing not properly installed or maintained; anti-siphonage or backflow prevention device not provided where required; equipment or floor not properly drained; sewage disposal system in disrepair or not functioning properly.

    BREAKING: DOH HITS MY FAVORITE CHINESE FOOD | Midtown Lunch - Finding Lunch in the Food Wasteland of NYC's Midtown Manhattan

  • After the blood passes through the aortic valve it closes to prevent backflow of blood into the left ventricle.

    How the Normal Heart Works

  • The mitral valve closes after the blood passes through to prevent backflow.

    How the Normal Heart Works

  • Once blood passes into the pulmonary artery the pulmonary valve closes to prevent backflow of blood into the right ventricle.

    How the Normal Heart Works

  • Dark blue steel wrapped the entire lower deck and the front half of the main deck, giving the yacht a substantial, armored appearance even as it rose and fell on ocean swells large enough to be the backflow from some giant sea beast.



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