back siphonage
Also found in: Dictionary, Encyclopedia.
back siphonage
A reversal of the normal flow of water or other liquid due to a negative-pressure gradient. Back siphonage in a water system may result in contamination, triggering a “boil order” (i.e., an order to boil water before drinking so as to kill potential contaminants).Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.