- a passageway through which surplus water escapes from a reservoir, lake, or the like.
Origin of spillway
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for spillway
You know its location: a mile, perhaps, from Gatun Dam and the spillway.Raiders Invisible
Desmond Winter Hall
It also serves as a spillway over which the surplus water escapes.Electricity for the farm
Frederick Irving Anderson
It could only race and swirl along one channel, and that was the spillway of memories.The Tyranny of Weakness
Charles Neville Buck
Here they could erect their spillway for the control of the water in the lake above.
The first stop was at the concrete work on the spillway dam at Miraflores.
- a channel that carries away surplus water, as from a damAlso called: wasteweir, spill
Word Origin and History for spillway
Online Etymology Dictionary, © 2010 Douglas Harper