spillway

[ spil-wey ]
/ ˈspɪlˌweɪ /

noun

a passageway through which surplus water escapes from a reservoir, lake, or the like.

Origin of spillway

First recorded in 1885–90; spill1 + way1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for spillway

spillway

/ (ˈspɪlˌweɪ) /

noun

a channel that carries away surplus water, as from a damAlso called: wasteweir, spill
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012