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.