- the source of a river, the set of streams that feed into the river's beginning
Etymology: compound head + waters
- 1823: James Fenimore Cooper, The Pioneers
- :... but when his brows began to wrinkle with time, and he stood alone, the last of his family, and his particular tribe, the few Delawares, who yet continued about the head-waters of their river, gave him the mournful appellation of Mohegan.
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