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Answer for the clue "A flow that returns toward its source ", 8 letters:
backflow

Word definitions for backflow in dictionaries

WordNet Word definitions in WordNet
n. a flow that returns toward its source [syn: backflowing ]

Wikipedia Word definitions in Wikipedia
Backflow is a term in plumbing for an unwanted flow of water in the reverse direction. It can be a serious health risk for the contamination of potable water supplies with foul water . In the most obvious case, a toilet flush cistern and its water supply ...

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

Usage examples of backflow.

That can cause backflow through the feed chute the next time you use the equipment.

Time itself once more, before the backflow spends its force and returns her to this grievous present again.

It was situated on the side of a large pool formed by backflow from the waterfall.

A three-second backflow, when I was seventeen years old, had burned a scar in my hand that had never really healed, the size of a silver coin.

The reaction will backflow until it reaches the dilithium chambers themselves.

Apparently the sulfur bacteria had overgrown the backflow sludge, and coupled with the fungal contamination from the downstream scrubbers created a disgusting mix of smells.

Commander Mog replaced a faulty backflow to eliminate an intercooler issue he reported yesterday.

Zeth had to let himself take the shen backflow as the fields collapsed.

So the upper channels are separated from the lower ones, which handle sexual vitality, and there are no backflows.

Apparently the sulfur bacteria had overgrown the backflow sludge, and coupled with the fungal contamination from the down-stream scrubbers created a disgusting mix of smells.