headwater

noun

head·​wa·​ter ˈhed-ˌwȯ-tər How to pronounce headwater (audio)
-ˌwä-
Synonyms of headwaternext
: the source of a stream
usually used in plural

Examples of headwater in a Sentence

the first exploration of the Missouri River from its mouth to its headwaters was made by Meriwether Lewis and William Clark in the early 1800s
Recent Examples on the Web
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From its headwaters high in the Oakland Hills throught the city's Fruitvale District to where the waters eventually empty into the Oakland Estuary and San Francisco Bay, Sausal Creek is a historic treasure. Molly McCrea, CBS News, 8 May 2026 Outdoor enthusiasts can explore miles of scenic trails at Lake Bemidji State Park, fish in pristine waters, or wade through the headwaters of the Mississippi River at Itasca State Park (40 miles southwest). Katy Spratte Joyce, Midwest Living, 7 May 2026 Fed by the Big Thompson River with headwaters high in Rocky Mountain National Park, Boyd Lake currently is at roughly one-third of its capacity. John Meyer, Denver Post, 1 May 2026 Already primed for catastrophe, townspeople’s discovery that developers had quietly targeted Acton for multiple battery projects stoked fears of industrial blight, fire and contamination of residential water wells and the nearby headwaters of Southern California’s last free-flowing river. Bloomberg, Oc Register, 23 Apr. 2026 See All Example Sentences for headwater

Word History

First Known Use

1612, in the meaning defined above

Time Traveler
The first known use of headwater was in 1612

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Cite this Entry

“Headwater.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/headwater. Accessed 11 May. 2026.

Kids Definition

headwater

noun
head·​wa·​ter -ˌwȯt-ər How to pronounce headwater (audio)
-ˌwät-
: the beginning and upper part of a stream
usually used in plural
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