Etymology
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watercourse (n.)

also water-course, c. 1500, from water (n.1) + course (n.).

updated on March 23, 2014

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Definitions of watercourse from WordNet

watercourse (n.)
natural or artificial channel through which water flows;
watercourse (n.)
a natural body of running water flowing on or under the earth;
Synonyms: stream
watercourse (n.)
a conduit through which water flows;
Synonyms: waterway
From wordnet.princeton.edu, not affiliated with etymonline.