[n] a conduit through which water flows
[n] a natural body of running water flowing on or under the earth
[n] natural or artificial channel through which water flows
body of water, branch, brook, channel, conduit, creek, crossing, flume, ford, headrace, meander, midstream, rill, river, rivulet, run, runnel, streamlet, tailrace, tidal river, tidal stream, tidewater river, tidewater stream, water
\Wa"ter*course`\, n. (Shipbuilding) One of the holes in floor or other plates to permit water to flow through.