Definition of headwater in English:

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headwater

Pronunciation: /ˈhedˌwôtər/ /-ˌwätər/

noun

(usually headwaters)
A tributary stream of a river close to or forming part of its source: these paths follow rivers right up into their headwaters
More example sentences
  • Swindon's location, so close to the headwaters of the River Thames, does not sit well with the normal sewage treatment works programme that allows some dilution effect to deal with pollution.
  • Rather than gushing down a lush mountainside, the headwaters of the river seen in The Source puddle prosaically beside a suburban high school.
  • Upland valleys and the headwaters of fast-flowing rivers descend to the coast through some of the world's largest swamps.

For editors and proofreaders

Syllabification: head·wa·ter

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