WATERCOURSE
watercourse, waterway
(noun) a conduit through which water flows
stream, watercourse
(noun) a natural body of running water flowing on or under the earth
watercourse
(noun) natural or artificial channel through which water flows
Source: WordNet® 3.1
Etymology
Noun
watercourse (plural watercourses)
Any channel, either natural or artificial, through which water flows.
Hyponyms
• Thesaurus:watercourse
Source: Wiktionary
Wa"ter*course`, n. (Shipbuilding)
Definition: One of the holes in floor or other plates to permit water to
flow through.
Source: Webster’s Unabridged Dictionary 1913 Edition