the race, flume, or channel leading away from a waterwheel or the like.
Mining. the channel for conducting tailings or refuse away in water.

1770–80; tail1 + race1

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World English Dictionary
tailrace (ˈteɪlˌreɪs)
1.  Compare headrace a channel that carries water away from a water wheel, turbine, etc
2.  mining the channel for removing tailings in water

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Control of the storm drain run off and sedimentation entering the tailrace.
The tailrace will return flow over a perched ledge to act as a barrier to fish migration into the tailrace.
The water continues past the propeller through the tailrace into the river past the dam.
Water from the turbine exits through the draft tube to the tailrace.
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