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spillway

American  
[spil-wey] / ˈspɪlˌweɪ /

noun

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


spillway British  
/ ˈspɪlˌweɪ /

noun

  1. Also called: wasteweir.   spill.  a channel that carries away surplus water, as from a dam

"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

Etymology

Origin of spillway

First recorded in 1885–90; spill 1 + way 1

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Next to the lake, a spillway flows into a stream that the Department of Water Resources refers to as Blue Canyon Creek.

From Los Angeles Times • May 19, 2024

Opening the spillway diverts Mississippi River water to Lake Pontchartrain and Lake Borgne, after which it flows to the Mississippi Sound in the Gulf of Mexico.

From Seattle Times • Jan. 24, 2024

The first thing I saw after claiming a parking spot was a vivid rainbow, hanging in the mist above the dam’s spillway.

From Los Angeles Times • Jul. 21, 2023

A vulnerable dam could be old, poorly maintained or not have enough spillway capacity to safely release water from the dam.

From Scientific American • Jul. 13, 2023

On this side of the lake there was a concrete wall with a spillway.

From "Bless Me, Ultima" by Rudolfo Anaya

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